Why do pancakes always roll up when pushed? Even without oil.

There are three main tools for baking pancakes: first, cigarettes, iron, round, large, medium and small. Medium-sized tobacco is about 65 cm in diameter, with a slightly convex center and three legs under it, which can be baked with firewood or coal. Xunzi is a special tool for baking pancakes. There is a note "Xunzi" in Kangxi Dictionary, and a sentence "Cooked Xunzi" in Guanmin Book in Tang Dynasty, which shows that pancakes have a long history. The second is holding a tool for pushing paste. Locals call it "Red Son", which is a wooden plate-shaped arc with a handle. After coating the paste on the hot tobacco, push it in the pool, and the paste will be thinly coated on the surface of the tobacco. Some of them use shovels and some use "bamboo chop", which has the same effect, but the baked pancakes have their own characteristics. The third is the oil scraper, which the masses call the oil scraper. It is a square wiper sewn with more than ten layers of cloth, soaked in edible oil to wipe tobacco to prevent pancakes from sticking. The making process of pancakes is complicated. It uses wheat, sorghum, corn, millet, sweet potato and other grains as raw materials, and is washed, soaked and ground into paste by a stone mill. People call it pancake paste. In other places, before grinding, 1/3 or half of the clinker is put in, which is called "half cooked". The masses say that the batter thus ground is easy to bake, and the baked pancakes are soft and delicious. It takes a lot of effort to grind paste. It usually takes two or three hours to grind twenty or thirty kilograms of grain, because the paste is too thick, and the baked pancakes are naturally not delicious. When grinding, the filler must be experienced and less, so that the ground paste is fine and uniform. In the old society, if a family can bear it, they often go to mill, and it takes more than half a night to grind twenty or thirty kilograms of grain. Only wealthy families with money can afford cows to push the mill. Now with the flour mill, you can also grind the washed grain into flour and add water to make it into paste. But people always think that it is not as fragrant as a stone mill. At present, there are ways to make pancakes by machine, but the taste of pancakes made by machine is not as good as that made by hand. The traditional process of making pancakes by hand is very complicated, including grinding the batter, erecting the seeds, spreading or rolling them flat, and storing them. Therefore, making pancakes by hand is often done in large quantities at one time and then stored for a long time. The following introduces the traditional pancake making technology in rural areas. Before spreading, oil is often applied to the seeds, which can not only remove impurities from the seeds, but also make the pancakes easily separated from the seeds. When the tobacco is hot, you can put a spoonful of pancake paste on the tobacco with a spoon and smear it around the tobacco with a rake. Because tobacco is hot, pancake paste solidifies quickly wherever it goes, so it is called pancake. Those that are not solidified are taken away by the rake, and this process is repeated until the whole tobacco leaves are scattered. The length of the rake is just equal to the radius of the tobacco, so the rake goes around the field and the pancake is ready. In order to improve the quality of pancakes, before the pancake paste on the upper layer is completely solidified and fried, scrape it with a wooden board (called scraping batch) to make it flat and even in thickness. Because pancakes are thin and easy to cook, they should be cooked very quickly, that is, twenty or thirty seconds, otherwise they will be burnt. When it is ripe, you need to grab the spread pancake on the edge of hazelnut in time with a shovel. The size of pancakes depends on the seeds, and the diameter is generally between half a meter and 80 cm. The amount of batter applied to seeds determines the thickness of pancakes, and people with high level can spread out thin pancakes. Pancakes are very technical and cooked. Pancake rolling is generally used to make pancakes with poor texture, mostly pancakes with dried sweet potatoes or corn as raw materials. Knead the flour into dough in a basin. After the dumplings are heated, roll the dough evenly on the dumplings with both hands, leaving a thin layer of dough on the dumplings. After baking, uncover and make pancakes. This kind of pancake is thicker. The pancakes made by this method are loose, and it is difficult to control the thickness of the pancakes. The thickness is related to the thickness of the flour mill. The coarse surface is coarse and the fine surface is fine. This is rarely done now. After a pancake is removed from tobacco, it is often placed on the next cover pad, and then the pancakes are stacked one by one. Pancakes just taken out of tobacco are so soft that they can be folded into rectangles and stored in urns. After air drying, pancakes become thin and crisp. Because a lot of water is removed during heating, pancakes can be stored at room temperature for a long time. In the past, they were essential food for long trips.