Because China is vast in territory and abundant in natural resources, with different climate, products, customs and habits, it has formed many flavors in its diet for a long time. There has always been a saying in China that "southern rice goes north", and the tastes are divided into "sweet in the south, salty in the north, sour in the east and spicy in the west", mainly in Bashu, Qilu, Huaiyang, Guangdong, Fujian and other places.