What does the solar term rice circle mean?

Special diet on Boxing Day. The meaning of solar term rice circle refers to the special diet on the day of the festival. For example, jiaozi is a solar term meal from the winter solstice, which refers to the special meals or snacks that all localities and ethnic groups must eat on the solar term day according to different dietary customs. For example, steamed Artemisia cake in Tomb-Sweeping Day, "long summer rice" and "long summer eggs" in summer, and jiaozi and wonton in winter.