The fluorine atom (floating element) mentioned by the ancients refers to: glutinous rice balls.

Tangyuan, also known as "Tangtuan" and "Floating Yuanzi", is one of the representatives of traditional snacks of Han nationality. At the same time, it is also the most distinctive food in the traditional Lantern Festival in China, and it also expresses the yearning and expectation of the ancient people for a happy life. According to legend, glutinous rice balls originated in the Song Dynasty. At that time, a novel food emerged in Mingzhou (now Ningbo City, Zhejiang Province).

that is, black sesame seeds and pig's suet are used as stuffing, a little sugar is added, and glutinous rice flour is rubbed outside to form a circle. After cooking, it tastes sweet and soft, with endless aftertaste. At the same time, glutinous rice balls symbolize family reunion, and eating glutinous rice balls also means family happiness and reunion in the new year, so it is a must-have food for the Lantern Festival on the fifteenth day of the first month.

spherical food made of glutinous rice flour usually has stuffing, which is cooked and eaten with soup. That is, dumplings. In some places, it refers to glutinous rice dumplings cooked with water and eaten with sugar without stuffing. The fifth and second chapter of the strange situation witnessed in twenty years: "The emperor's side is a burden to sell dumplings, and that fire is the fire to cook dumplings." Sha Ting's "The Story of the Trapped Beast" 25: "The sun has set and the burden of glutinous rice balls has gone to the street."

Tangyuan originated in the Song Dynasty in China. At that time, Mingzhou (now Ningbo City, Zhejiang Province) began to eat a novel food, that is, black sesame seeds and white sugar were used as raw materials. First, black sesame seeds were ground into powder, then lard and white sugar were put into the mixture one after another and kneaded into balls to make stuffing, and glutinous rice flour was used to knead it into a circle outside. After cooking, it tasted sweet and delicious.