Tangyuan is one of the representatives of traditional snacks of Han nationality. It is a spherical food made of glutinous rice flour, usually filled with soup and cooked. It is also the most distinctive food of the Lantern Festival. It has a long history. According to legend, Tangyuan originated in the Song Dynasty. At that time, Mingzhou (now Ningbo City, Zhejiang Province) began to eat a novel food, which was filled with black sesame seeds and oil, added with a little sugar, and kneaded into balls with glutinous rice flour outside. When cooked, it tastes sweet and delicious. Because this kind of dumplings cooked in a pot will float and sink, it was originally called "floating Zi Yuan", and later it was renamed Yuanxiao in some areas. It is said that Yuanxiao symbolizes family reunion, and eating Yuanxiao means happy family reunion in the new year, so Yuanxiao on the fifteenth day of the first month is necessary.