Because in the traditional customs of Ningbo, sweet potato wine-brewed soup fruit is one of the must-eat delicacies in the winter solstice.

"Fan" and "Fan" are homonyms. In Ningbo people's understanding, eating sweet potatoes on the winter solstice means "turning over" all the bad luck of the past year.

tangguo is similar to tangtuan, but it is much smaller and has no stuffing. Tangguo is also called a dumpling, which means "reunion" and "perfection". There is also a saying in old Ningbo that "you are one year older after eating soup".

Ningbo people are used to adding wine to make sweet potato soup. In Ningbo dialect, wine brewing is also called "pulp board", and "pulp" is homophonic with "rise" in Ningbo dialect, taking its good color of "high fortune" and "high happiness"