Ancient people found that when cooking jiaozi, jiaozi would float up and down in the water, roll with the boiling water and float on the water until it was cooked. According to this feature, they named them "Floating Zi Yuan" and later renamed them jiaozi.

Tangyuan is a ball in shape, symbolizing reunion. People in China eat glutinous rice balls on the Lantern Festival, hoping for a family reunion in the new year. In the Song Dynasty, people in Ningbo, Zhejiang Province made this kind of food with white and tender appearance and sweet filling for the first time with glutinous rice flour produced locally, lard, black sesame and sugar.

Introduction to the fifteenth day of the first month:

The fifteenth day of the first lunar month is the Lantern Festival. Also known as Shangyuan Festival, Lantern Festival and Lantern Festival. According to legend, Emperor Wendi of the Han Dynasty (179- 157) celebrated Zhou Bo's suppression of the rebellion of the Lus on the 15th day of the first month. Every night, he will go out to play and have fun with people.

In ancient times, night was the same as night, and the first month was also called January. Emperor China designated the 15th day of the first month as the Lantern Festival, and this night was called Yuanxiao. Sima Qian founded the taichu calendar, which listed the Lantern Festival as a major festival. Since the Sui, Tang and Song Dynasties, it has been in full swing.