According to legend, at the end of the Eastern Han Dynasty, Zhang Zhongjing, a "medical sage", served as the magistrate of Changsha, then resigned and returned to his hometown. Just in time for the winter solstice, he saw that the people in Nanyang were hungry and cold, and their ears were frostbitten. At that time, typhoid fever was prevalent and many people died. Zhang Zhongjing summed up the clinical practice of the Han Dynasty for more than 300 years, so he set up a medical shed in the local area and set up a cauldron. He made mutton, pepper and herbs for dispelling cold and warming up into ears with flour bags, cooked them and gave them to the poor together with soup and food. People eat from the solstice of winter to New Year's Eve, fighting typhoid fever and curing frozen ears. Since then, villagers and future generations have imitated it, calling it "jiaozi Ear" or "jiaozi", and some places called it "flat food" or "instant noodle jiaozi". After gradually forming a custom, you can't help eating jiaozi on holidays.