The winter solstice group can be used to worship ancestors or give gifts to relatives and friends. In the past, Shanghainese were most particular about eating jiaozi. An ancient poem said, "Every family beats rice to make glutinous rice balls, knowing that it is the winter solstice of the Ming Dynasty." . "Circle" means "reunion" and "perfection". Eating jiaozi on the solstice in winter symbolizes family harmony and good luck.

On the solstice of winter, it is necessary to "make dumplings" or "make dumplings". These are also officially recorded in historical materials. The history says that "on the winter solstice, powdered glutinous rice is a pill, which is called' glutinous rice balls'". After jiaozi is wrapped up, it is necessary to offer sacrifices to the gods and ancestors, and then the whole family will eat around. This is called "adding years". Therefore, it is very old to eat glutinous rice balls on the solstice in winter.

The results of modern medical research show that black sesame in glutinous rice balls has significant medical and health care functions. Vitamin E in black sesame is very rich, which can delay aging, moisten five internal organs, strengthen bones and muscles, invigorate qi and strengthen body, prolong life, nourish liver and kidney, moisten spleen and lungs, and has dietotherapy effect on alopecia and white hair.