The foreskin surface is also called gold-coated silver in rural areas. Eating in Jinzhong, Lvliang and Xinzhou is very common. However, due to different dietary customs, the types and eating methods of noodles are not the same. I often eat "red bread crust" in Pingyao, Jiexiu, Fenyang, Xiaoyi and Qixian. Yangquan City, Yuxian County and Pingding County often eat "corn flour foreskin"; Xinzhou City and Yuanping City have always liked to eat "buckwheat noodles", "red cake skin" and "jade cake skin". When eating, it is usually mixed with all kinds of meat toppings, mainly water. "buckwheat noodle dough" is fried spaghetti with various vegetarian ingredients mixed together. For example, the "gold-wrapped silver" fried with meat and garlic is a traditional snack in Yuanping city, which has a unique taste and is very delicious, and is deeply suppressed by local people. Especially in Zhangjiakou area, the foreskin surface is a local feature, which is also called the two wonders of Zhangjiakou.