It takes 5 to 10 minutes to cook jiaozi. If small and medium-sized dumplings are cooked with high fire, it will take 5 minutes, but with warm fire. Jiaozi is very big, and it takes 7 to 10 minutes. When jiaozi floats, it means that jiaozi is ripe. Tangyuan is one of the traditional snacks in China, which originated from Mingzhou in Song Dynasty (Ningbo, Zhejiang, 2 1 century). The main raw material is glutinous rice flour, and the outside is covered with stuffing made of black sesame, pork suet and white sugar. It is sweet, soft and delicious after cooking, which symbolizes the happiness of family reunion. Therefore, in China, especially in the Lantern Festival on the 15th day of the first month, eating glutinous rice balls has become a custom, which indicates the new year.