Jiaozi originated from the ancient trough. As early as the Three Kingdoms period, this kind of food was mentioned in the book Guangya written by Wei. According to textual research, it is a "crescent wonton" from the Southern and Northern Dynasties to the Tang Dynasty. And the "dried meat double trough" in the Southern Song Dynasty, which has a history of 1400 years. According to the historical records of the Qing Dynasty; During the Chinese New Year, everyone will go together when they are happy, such as eating flat food and becoming famous. "He added," Every junior high school, rich or poor, uses white flour to wrap jiaozi, which is called sesame seed cake, and it is the same all over the country. A rich family is hidden in gold and silver treasures. If it succeeds, those who have food to support their families will be lucky in the end. "This shows that people eat jiaozi during the Spring Festival, which means saying goodbye to the old year and welcoming good luck in the new year. In the "Clear Barnyard Grass Notes" edited by Tsui Hark, a close friend, he said: "There is stuffing inside, or powder horn-it can be steamed and fried, and it can be boiled in water, which is called jiaozi. "For thousands of years, jiaozi, as a New Year's food, has been loved by people and has been passed down to this day. According to legend, at the end of the Eastern Han Dynasty, Zhang Zhongjing, a "holy doctor", served as the magistrate of Changsha, then resigned and returned to his hometown. On the first day of winter, 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 summarized the clinical practice of the Han Dynasty for more than 300 years, so he set up a medical shed and cauldron in the local area. He used mutton, peppers and herbs to get rid of cold and heat. After cooking, even the soup is distributed to the poor. Since then, villagers and future generations have imitated it, calling it "jiaozi Ear" or "jiaozi", and some places called it "flat food" or "noodle soup". Later, it gradually became a custom, and it was absolutely necessary to eat jiaozi on holidays. )