A snack can be seen everywhere in Xining, Qinghai, and vendors in towns and villages in agricultural areas. It is jelly-like, thick, dark brown or light white in color, with gluten, vinegar, spicy oil, mustard, leek, garlic paste and other condiments. It tastes spicy, cool, flexible and delicate, and has a long aftertaste. This kind of snack is called "fermented skin" and is a traditional snack with strong local flavor in Qinghai.

? Although stuffed skin is a snack, it is suitable for both hot and cold, and can be eaten in all seasons. It can be used as a staple food to satisfy hunger, or as a dish to serve as a cold dish, so it is called the first choice of Qinghai cuisine, and people who come to Qinghai can't wait to taste it.

? In fact, the snack "Niangpi" is no stranger to the northwest people, and the processing technology is basically the same, but there are obvious differences in the appearance of raw materials and finished products. Ningxia people call it "Niangpi" and Shaanxi people call it "cold rice noodles". Niangpi, a special snack in the northwest, entered the land of Shaanxi and Qin, called "dough"; After entering Jiayuguan, he said "cold rice noodles". In fact, no matter what kind of name it is, it only summarizes one aspect of this kind of food.

? There are many raw materials for making skin, from mung bean flour, sorghum flour to wheat flour. It seems that anything rich in starch can be selected. When making wheat flour, a certain amount of plaster and dressing are mixed into it, and then it is mixed with warm water to form a hard dough. After several times of kneading, the dough is continuously rubbed in cold water, and starch is washed out. When the dough becomes a honeycomb, it is steamed in a steamer, which is called "gluten", and then the precipitated starch paste is steamed in a steaming tray, which is called "steamed skin". Steamed stuffed skin, peeled from the plate, cut into long strips, served with gluten and cold seasoning, can be served.

? Stuffed skin looks unremarkable, but it is soft and smooth, sour and delicious, refreshing and appetizing. It is the most popular variety of Qinghai-style snacks, which is loved by men, women and children, especially by women. Xining's fermented skin is unique, with oily paste, red and spicy flavor and sour fragrance. The golden and translucent fermented skin is smooth, tender and refreshing, and the oily and bright seasoning is sour and fragrant, which can arouse the appetite of eating goods.