Heritage of the Anatolian geography: registered varieties of ancestral wheat (siyez, gacer, and menceki)

Turkey is one of the major regions of wheat cultivation where wheat has economic, social, cultural, and archaeological values. The Anatolian lands are the homeland of wheat and the gene center of ancestral wheat varieties. Having survived without any genetic modification, ancestral wheat is a biological and cultural heritage. The rich nutritional value, unique flavor, and aroma of ancestral wheat varieties make them more valuable than their modern equivalents. However, prioritizing the production of modern wheat varieties has prompted the oblivion of ancestral ones and a decline in their production. This study aimed to raise awareness about the registered ancestral wheat varieties (i.e., siyez, gacer, and menceki), the cultural heritage of Anatolia, which has sunk into oblivion. To this end, it tackled the general characteristics of ancestral wheat varieties, an indispensable part of the Turkish cuisine, their nutritional value, and their use in local cuisines. Increasing the use of these registered ancestral wheat varieties in local culinary cultures and ensuring the sustainability of local values increases the significance of this study.


Introduction
In Turkey, it is still possible to find areas where our cultural values, such as local varieties, are prioritized, our traditional values continue to be protected, and development studies based on this are initiated.One such value is ancestral wheat.In addition to being a strategic product of wheat, with a history of 10,000 years in Anatolia, ancestral wheat is a cultural heritage [1][2][3].As such, Turkey is the homeland and gene center of wheat.Having been cultivated globally for centuries, wheat varieties are obtained from "hereditary seeds," which are ancestral heritage.Ancestral wheat varieties are an essential gastronomic element that have survived through the pressures of natural and artificial selection, have not been genetically modified, and appeal to local tastes.They have been humanity's most basic gastronomic element from the past to the present.
Considered the ancestor of wheat, "ancestral wheat" constitutes 0.0727% of Turkey's annual wheat production of 22 million tons [4].The rapid spread of modern wheat varieties with high grain yield obtained by the improvement studies that started with the green revolution has prompted a decline in ancestral wheat production.This has consequently expedited the genetic erosion of local wheat varieties born in the "Fertile Crescent Region" about 10 thousand years ago and survived until today.
In this context, supporting the local wheat varieties produced globally in small quantities makes it essential to protect these resources and transfer them to future generations.Also registered by the Turkish Patent and Trademark Office, "Kastamonu Siyez, Kayseri Develi Gaceri, and Elazığ Menceki" wheat varieties are protected by geographical indications.In addition to all these activities to protect ancestral wheat varieties that have been among the staple foods since ancient times, this study aimed to raise their awareness and reveal their importance to cultural heritage.In this regard, this study tackled the general characteristics of ancestral wheat varieties, an indispensable part of Turkish cuisine, their significance for nutritional value, and their use in local cuisine.

Methodology
The present study, the place of registered ancestor wheats (siyez, gacer, menceki), which is the cultural heritage of Anatolia, in Turkish Cuisine culture is mentioned by using scientific articles from different databases such as Google Scholar, Scopus, Elsevier, Ulakbim, and Dergipark.
It has been observed that the studies on the use of "Kastamonu Siyez, Kayseri Develi Gaceri, Elazig Menceki" wheats, which are also registered by the Turkish Patent and Trademark Office, in the field of gastronomy are limited.In this sense, data were collected for the study through comprehensive document analysis in order to explain the history, rituals, use of these ancestral wheats in Turkish Cuisine culture, and their recipe examples and their effects on health.

Wheat in Turkish culinary culture
Culinary culture is a reflection of the shaping of talent and skill with the geography where one lives.Food and culinary cultures overly bear the effects of geography and point to the cultural values that form the relationship of a place with taste.Food products are not mere objects but the reflection of the knowledge and skills of rural societies as a result of their relations with nature.Geography has shaped people and cuisines and given them an identity.The local flavors in foods, therefore, reflect the geography lived [5][6][7].Wheat and wheat products formed the basis of Anatolian Turkish culinary culture since wheat is a custom from the Central Asian culture and Anatolian lands are the homeland of wheat [8,9].
Constituting an ancient culture in the Anatolian lands, wheat and wheat products have taken their place in both culinary and verbal cultures, so much so that wheat has been the primary food source in Anatolia and has been viewed as a cultural, social, and historical value [10].Wheat has therefore been regarded more than food, as a fertility, date, and tradition.It has also been viewed as a symbol of fertility, a value that should not be dropped or wasted.An ancient product for all civilizations have lived in Anatolia from the past to the present; wheat has taken its place in celebrations, weddings, feasts, and death ceremonies.In this sense, wheat and wheat products have become foods of great value that are revered and attributed to sacredness [10][11][12].Wheat is not only used as the main ingredient of the dishes in Turkish cuisine but is also consumed as bulgur [ground wheat], cracked wheat, semolina, and flour.Obtained by boiling the wheat properly, drying, breaking, and thinning after peeling, these products are among the indispensable foods of Turkish culinary culture [9].
Bulgur is acquired by boiling and grinding wheat.It is divided into coarse and fine bulgur according to its place of use.Cracked wheat (dövme) is the wheat whose bran is separated by being beaten with wooden pestles on large stone mortars (Fig. 1) to separate the dried wheat from its scabs.It is used in some soups and Ashura desserts [8].
Semolina is one of the processed forms of wheat and is obtained by grinding it.Also known as coarse and semolina flour, semolina is generally used in desserts and bakery products [14].
Ancient people ground wheat by beating it in large stone mortars and, over time, replaced them with stone hand mills (Fig. 1) with circular rotation movement.Wheat was ground into flour using stone mills.Moved by human and animal power in the early times, these stones were run by wind and water power over time.Today, technological developments have enabled the grinding of wheat in modern factories [14].Bread is one of the most valuable wheat products in Anatolia.Many local-specific bread types have emerged with local production techniques and tastes.Among these are phyllo (yufka), lavash, tandoori, thin, fatir, kömbe, chapati, and unleavened, as well as the local ones made with such ingredients as potatoes and chickpeas [10].As a reflection of the Turkish Culinary culture, wheat and wheat foods are served in different ways as soups, dishes, patties, or bread on weddings, holidays, and special occasions [9,15].Many works remaining of several Anatolian civilizations also show that wheat has been an indispensable food item in Turkey [10][11][12].Viewed as the driving force of cultural formations, wheat has been considered sacred in Anatolian lands and has been the source of many rituals, some of which are: Keşkek In Anatolia, keşkek is prepared by cooking wheat with meat, beating it until it becomes a paste, and drizzling clarified butter.Keşkek varies from region to region in terms of cooking methods and ingredients.Handed down by the Anatolian communities from the past to the present, this heritage has become a cultural phenomenon due to its symbolic characteristics.The most salient symbolic characteristic of the traditional ceremonial keşkek is that it is made in unity and solidarity as a ritual in certain ceremonies.Due to this characteristic, keşkek was added to the Intangible Cultural Heritage List of the United Nations Educational, Scientific and Cultural Organization (UNESCO) in 2011 as a "ceremonial keşkek tradition" dish [16].
Ashura An indispensable tradition of the Turks, ashura, is a ritual to ensure unity and solidarity.Despite the variations in the amount and type of ingredients in ashura from the past to the present, wheat has been the main ingredient in all ashura recipes.Boiled wheat, dried beans, chickpeas, dried apricots, walnut kernels, almonds, figs, seedless raisins, water, granulated sugar, orange peels, and rose water are used for pudding.For decoration, cinnamon, pomegranate seeds, walnut kernels, hazelnuts, pistachios, cloves, nutmeg, and chopped orange peels are used.Prepared and cooked in houses with 41 different ingredients, ashura is offered to nearby neighbors after being cooked and ready for serving.It is safe to say that this tradition, maintained culturally and religiously in Turkey, is the day when all elements belonging to the fundamental values of brotherhood, unity and solidarity, friendship, cooperation, love, and respect are prioritized [17].
Tooth wheat Wheat is boiled when a newborn child teethes.This wheat is called tooth wheat or diş hediği and is consumed by neighbors and relatives [10].

Turkey's ancestral wheat varieties
Local wheat varieties are often referred to as "hereditary wheat" in public.Wheat is the oldest kind of grain and is defined as an "heirloom variety," meaning "a value passed from generation to generation."Archaeological studies show that the place where wheat first appeared and spread to the world was the "Fertile Crescent."The first cultivated wheat species in the world are Einkorn (siyez) and Emmer wheat.Archaeological studies based on modern DNA fingerprint data show that wild Einkorn wheat (T.monococcum) was first cultivated near Karacadağ, which is located within the borders of Siverek district of Şanlıurfa in the Southeastern Anatolia Region of Turkey [4].
Ancestral wheat is a wheat variety grown in a particular region for at least one generation.Having a genetic resource and usually a local name (e.g., Kastamonu Siyez, Develi Gaceri, Elazığ Menceki), ancestral wheat has not experienced an official improvement process but a process of adaptation to the local conditions of the area in which it is grown, and is compatible with the local knowledge, habits, and traditions of the communities that developed it.Cultured forms of ancestral wheat were grown in various parts of Anatolia, especially starting from the northern part of the Fertile Crescent, and spread from Anatolia to the whole world.Turkey is a significant gene center hosting 23 wild ancestral wheat varieties (e.g., Triticum, Aegilops, Amblyopyrum, Dasypyrum), especially in the primary and secondary gene pools [4,18].
The ancestral wheat population in Turkey consists of 58.28% bread wheat, 37.93% durum wheat, and 3.79% coarse wheat.Being an important center in Turkey, the Southeastern Anatolia Region ranks first in terms of variety.Table 1 shows the natural distribution of ancestral wheat varieties by region in Turkey [4].Siyez wheat (Triticum monococcum L. subsp.monococcum) is one of our oldest ancestor wheat varieties [19].Fry the butter in a copper pan, and when it foams, pour it over the mix and serve hot [30] Fry the butter in a copper pan, and when it foams, pour it over the mix and serve hot [30] and cook for 5 more minutes Add sour ayran or yogurt and finely chopped greens, Take the mix to the serving plate once reaching the consistency of a thick paste.Add red pepper flakes on top and stir.Pour the sauce over the dish and serve [32] Fry the butter in a separate pan Crush the cooked meat thoroughly and mix until it gets a paste-like consistency

Turkey's registered ancestral wheat varieties
In Turkey, ancestral wheat is produced only in mountain villages on rough and barren lands by small farmers' own means.Several steps are taken to sustain the production of these few local wheat varieties in Turkey today.One of these steps is registration.Considered to derive their quality and originality from the geography in which they grow, these values are protected by registration processes such as geographical indication and presidia.Three ancestral wheat varieties are protected and registered in Turkey: Siyez, Develi Gaceri, and Elazığ Menceki.

General characteristics of Turkey's registered ancestral wheat varieties
Siyez (Triticum monococcum) Predicted to have been cultivated in Southeast Anatolia for the first time in the world, siyez is one of the most important cultural heritage elements of the Anatolian lands, so much so that the adventure of wheat in Anatolia is too old to be predicted.The Anatolian lands have been decisive in civilized history as the geography where wheat was improved and spread to the world for the first time on earth [4,18].One of the first names given to siyez wheat cultivated by many civilizations in Anatolian lands is Zız, a Hittite word [12,20].Siyez is one of the chief varieties of our ancestral wheat and is currently grown in northern and northern transition regions of Turkey, especially in Kastamonu.It is also grown in Balkan countries and France [10].Siyez is not genetically modified and has a richer nutrient content than cultivated wheat varieties, which increases its value.In addition, siyez is very low in gluten.Siyez is a significant wheat variety for Anatolia not only because of its unchanged genetic structure or its more health benefits but also because it is a seed that we must protect [21] (Figs. 2 and 3).Siyez wheat (Fig. 4a) is mainly consumed as bulgur.Boiled in hot water, siyez wheat is dried under natural conditions, cracked in stone mills, and turned into bulgur [21].In addition to bulgur, siyez wheat is also used in making bread by turning it into flour (Fig. 4c) [12,21].Despite its primary use as bulgur, siyez flour is now used as tarhana, pasta, and even mantı (Turkish ravioli) [21].
It is able to find the following siyez products in the ecological markets in Turkey: noodles (with vegetables), bulgur, pasta, couscous, cracked wheat (dövme), wheat paste, flour, whole flour, bread types (e.g., walnut, olive, village, ancient sourdough siyez (Fig. 4d), and flat), buttered simit, poğaça (bun), and breadsticks.With limited production area in the world and danger of extinction, siyez wheat must be preserved and transferred to future generations.For this purpose, it was protected by geographical indication in 2020.This geographical indication was registered on 25.09.2020 to be protected as of 04.01.2019 within the scope of the Industrial Property Law No. 6769 and received the designation of origin [22].In addition, siyez bulgur is one of the three products selected from Turkey within the scope of the Presidia Project, carried out by the Slow Food Foundation in Italy to protect food products that are in danger of extinction [20].
Gacer is grown using traditional methods in Italy, Spain, Turkey, Austria, and the Czech Republic.In our country, it is still grown by a few farmers in Kastamonu, Sinop, Kars, and Kayseri Provinces.Gacer is also grown as bulgur wheat under local names such as "Çatalca" in mountainous regions in the northeast of Turkey [24].Develi Gaceri might be ready for use by blending once removed from husks during or after harvesting Gacer (Fig. 5b).While table bulgur and rice have to undergo many fabrication processes to become the final product, gacer seeds might be used by merely separating them from their husks.Its direct use in soups, meals, and pilafs makes it an alternative to rice and processed bulgur.
Rich in high-quality protein and an alternative to rice and processed bulgur, gacer wheat might be used for making pilaf, soup, dolma, and meatballs, while its flour might be used for bread (Fig. 5c, d) Gacer cakes and halva [23][24][25].In addition, gacer is a variety of wheat frequently sought for obtaining unleavened bakery products in the region [12].Develi Gaceri was registered on 22.06.2022 to be protected as of 26.01.2021 within the scope of Industrial Property Law No. 6769 and received a geographical indication [26].
Elazığ menceki wheat (Triticum durum ssp.Compactum) Elazig Menceki wheat is obtained from the Triticum durum ssp.Compactum (club wheat) subspecies, Triticum (wheat) genus.This geographical indication was registered on 16.09.2021to be protected as of 02.03.2021 under Industrial Property Law No. 6769 [27].Elazığ Menceki wheat is a wild emmer variety that occurs naturally in nature and has preserved its genetics.Produced from its own seed, this wheat variety depends on the geographical border concerning the production method.Being a 4,000-year-old ancestor seed, Elazığ Menceki wheat (Fig. 6a) is also frequently used in dishes and soups in the region [27].Its use as bulgur (Fig. 6b) is especially more common.It has a central place in the local cuisine as the main ingredient of dishes unique to Elazığ cuisine, such as pilaf types, stuffed meatballs, kısır (bulgur-based salad), tarhana, keşkek, sarma (stuffed vine leaves) types, and Harput meatballs.Depending on the climate and soil structure of Elazığ, the unique taste and smell of Menceki bulgur is the most significant predictor of consumer preferences.Therefore, the most salient feature of this bulgur, along with its taste and smell, is that it does not become doughy [28,29].

Traditional recipes with the registered wheat varieties
Wheat is one of the fundamental ingredients of Turkish cuisine, and foods such as bulgur, semolina, and flour obtained from wheat have great importance.The variety of food made from grain products is therefore also pretty high.Table 1 presents the traditional recipes made from these wheat varieties.gather.Following the wheat harvest in the region, gathering in the village squares to celebrate the siyez harvest has become a tradition [30].

İhsangazi Sour Pilaf is one of the most well-known dishes of Kastamonu Province cuisine and has a long history. It is traditionally served on special occasions such as weddings and holidays, where local people
Unique to the Harput region, this meatball is made on many special occasions, such as holidays, weddings, and festivals.Bearing the district's name, this dish is one of the first delicacies many tourists from outside the city and the country try when introducing the region.It is one of the essential dishes offered to the guests of the restaurants in the region, served by local dishes on their menus [31].
Keşkek, on the other hand, is a traditional Anatolian dish that differs according to region, is usually made at weddings and holidays, and comprises mainly of cracked wheat and meat.Keskek is 'the ceremonial dish obtained by cooking wheat and meat together in large cauldrons and open fire through participation and work sharing.' It is well-established that within the borders of Anatolia, the content and cooking methods of Keşkek show some differences, albeit small, in all regions [33].It is also known that Keşkek is made locally in almost every Anatolian region.It has been named differently across the regions: 'dövme pilavı' or 'dövme aşı' in Hatay, Adana, and Gaziantep, 'herse' in Rize, 'herise' in Konya and Gaziantep, 'hırısi' in Hatay, and 'gendirme pilavı' in Erzincan [34].Keşkek is of Persian origin as a word.Additionally, it is called 'herise' in Arabic and 'döğme aşı' in Turkish [35].Keskek dish is included in Mevlana's work called 'Mevlevi Cuisine' with the name "herise" [36].

Nutritional value and health effects of ancestral wheat
With a history as old as human history, wheat is considered the most important food for global consumption.FAO statistics reveal that the annual wheat consumption per capita is 173.5 kg, while this figure is 79.5 kg in the USA, 85.4 kg in Germany, and 106.4 kg in France.These figures suggest that we live in a world mainly fed with wheat products [10].19% of the daily calories and 21% of the protein needed for humans are obtained from wheat.In addition to being a source of starch and energy, wheat grains have several beneficial components with protein, vitamins, dietary fiber, phytochemicals, and antioxidant activities necessary for health.Furthermore, whole wheat grains are the most suitable food source created according to human metabolism and needs [37].Among the wheat varieties, ancestral wheat is considered a functional food with its rich nutritional content.Ancestral wheat has been given functional food status due to its properties, especially its high fiber content, higher antioxidant compound concentrations, high protein digestibility, positive effects on the gut, and less harmful effects on gluten-sensitive people [38].For this reason, the ancestral wheat varieties registered in Turkey (i.e., siyez, Develi gaceri, menceki) and their effects on health have aroused interest among consumers and researchers [39].Table 2 compares the nutritional properties of refined and registered ancestral wheat varieties.
The most salient feature of ancestral wheat varieties is that their genetic features and DNA cannot be modified.With high nutritional value, ancestral wheat varieties are unrefined primitive wheat consumed in the past.Ash, protein, fat, zinc, calcium, and iron content of ancestral and other refined wheat varieties are given in Table 2.As this table indicates, the higher nutritional value of ancestral wheat varieties, including protein, minerals, vitamins, fibers, and fat, than the refined ones suggests their health benefits.Research has shown that ancestral wheat varieties (i.e., siyez, gacer, menceki) have higher antioxidant content and lower glycemic index.It has also been stated that they are high in lysine, glutamic acid, carotenoid, lutein, phenolics, and tocopherol [45,46].Additionally, their protein content (13.2-14.83gr/100 gr) was found to be higher than that of other refined wheat varieties (10-12 gr/100 gr).In this case, compared to today's commercial wheat varieties, the protein content of ancestral wheat varieties is higher, with a low carbohydrate ratio.It, therefore, suggests that ancestral wheat is healthier than other refined flour.In this sense, mainly high-protein bulgur is obtained after the hulls are tempered and separated from the grains of siyez, gacer, and menceki wheat.In addition, noodles, tarhana, pasta, village bread, and wheat paste are made [3,19,47,48].
As Table 2 displays, ancestral wheat varieties have higher oil content than the refined ones.Their high-fat content also makes them more delicious than bakery products from other wheat varieties [19].An examination of the vitamin content of siyez wheat, one of the ancestral wheat varieties, showed that the amount of folic acid, which plays a role in forming blood cells and preventing anemia, was higher than in other wheat varieties [49].Ancestral wheat varieties are also rich in minerals such as calcium, iron, and zinc compared to other refined bread (common) wheat.Especially the iron, calcium, and zinc composition of Develi Gaceri and Elazığ Menceki wheat is higher than the mineral content of bread wheat.Based on all these features, the chemical components of ancestral wheat varieties have a protective role in reducing the risk of coronary heart disease, Type 2 diabetes, hypertension, and some types of cancer.Research has also shown that they help with weight management [50][51][52][53].

Conclusion
This study examined the registered non-genetically modified ancestral wheat varieties grown in Turkey.Wheat is a staple food considered sacred and valued in the Anatolian culture.Used in many traditional dishes in Turkish culinary culture, wheat has become not only a food but also a cultural phenomenon.Both the meanings attributed to it in traditional culinary culture and its leading role in many food rituals have brought wheat to the fore.The Anatolian lands are the point of origin of wheat, and it has been produced in this region for years, contributing significantly to the formation of all this cultural accumulation.In the twenty-first century, many wheat varieties cultivated by preserving their first domesticated form are still present in Anatolia.However, some native ancestral seeds were improved and genetically modified with the green revolution to increase wheat production.The ancestral seeds that survived in their original forms without being genetically modified resemble biological heritage.Conservation of this heritage and supporting the production and protection of these seeds are significant to ensure their sustainability and delivery to future generations.
Turkey has great potential for biological diversity, genetic resources, and local products.These values are protected and registered by the Turkish Patent and Trademark Office.The siyez, gacer, and menceki wheat varieties have been registered and protected in Turkey.Their genetic features are protected, and they are granted geographical indications by establishing a connection with their origin of production.These geographical indications might prevent these wheat varieties from being lost culturally and biologically and ensure the transfer the traditional knowledge and usage practices to future generations.The protection of local varieties should not be limited to the registration process.Farmers should be supported in line with national targets and policies, and production should be boosted.In addition, the culinary culture should be endorsed with traditional recipes of local products such as ancestral wheat.In this context, marketing and promoting the recipes of ancestral wheat varieties in culture through local stories is crucial for creating awareness.In this sense, it is essential to boost the production and consumption of these wheat varieties, qualifying as cultural heritage, which are about to disappear with the spread of modern wheat varieties.

Implications for gastronomy
Bread is the most significant product identified with wheat in every field of its production.In Anatolian culture, bakery products are not limited to bread but include popular bakery products such as phyllo, kadayıf, bulgur, noodles, couscous, pasta, and keşkek.All these products are significant milestones for local development dynamics.The production of these local products using registered local wheat varieties along with individual methods and techniques is thought to increase awareness of the products, sustainability of local wheat varieties, preservation of culture, and local development.
Ancestral wheat varieties are rich in nutritional value, albeit low in yield and hard to harvest than the modern ones.Their higher nutritional content than modern wheat makes them valuable as a functional food.With these features, ancestral wheat varieties are an alternative food source for consumers aspiring for a healthy diet.

Fig. 1
Fig.1Stone Mortar and Hand-mill[13].Since ancient times, people have developed different methods to separate the grains from their husks, crush them, and turn them into flour.Large stone mortars, one of the most important methods used for grain processing, were used to separate the husks from the grains and turn them into flour (a) This is called the grinding process by striking (beating) the grains in the carved stone.Hand mills with circular rotational movements have replaced this beating over time.Hand mills have two parts, and the upper and lower hand mill stones comprise two same-sized stones (b)

Fig. 3 Fig. 4
Fig. 3 Ancestral wheat varieties by regions of Turkey

Fig. 5 Fig. 6
Fig. 5 Processes of Gacer wheat a gacer ears, b gacer grains, c gacer flour, d gacer bread.Gacer wheat a is harvested (b) after it is grown and used for many different purposes.Flour obtained from this wheat is generally preferred more in unleavened dough products (c, d)

Table 1
List of ingredients and the cooking methods of the foods with siyez, gacer, and menceki wheat/bulgur Methodİhsangazi Sour Pilaf Ingredients 450 g siyez bulgur 1 onion 2 green peppers 30 ml sunflower oil 30 g butter 800 ml water 10 g salça (a mix of tomato and pepper paste) 500 ml sour ayran or 300 g yogurt 6 g salt 5 g red pepper flakes 7 gDrain the cleaned and rinsed Kastamonu siyez bulgur.Chop the green peppers and onion and stir-fry until pink Add salça, hot pepper paste, and Kastamonu siyez bulgur to the mix and fry for 1-2 min, then add 4 cups of water and cook for 20 minDried Spearmint Greens1 bunch of parsley, dill, mallow, fresh nettle ¼ bunch of scallions Half a bunch of spearmint Half a bunch of green pepper leaves 5-6 vine leaves

Table 1
(continued) [32,33]eces the size of grapes from the mix Place the cooked meatballs on a serving plate and serve with broth[32,33]Add the meatballs to the boiling water with tomatoFry them in a saucepan with heated oil and add tomato and pepper paste and roll them Table 1 (continued) Method Keşkek Ingredients 500 g gacer wheat A whole piece of beef brisket 300 g chickpeas 50 g butter 3 gr red pepper flakes 1.5 l water Salt Gacer wheat, beef brisket, chickpeas, butter, red pepper flakes, salt Put the medium-sized chopped meat in the saucepan.Add the soaked chickpeas and wheat.Add approximately 1.5 l of water to overtop the wheat Cook it on high heat until it comes to a boil and then on low heat for 1 h