One winter was particularly cold, with the wind howling from the north, and many people got frostbite, and some even froze off their ears. In order to heal the people, Zhang Zhongjing invented a new medicine, which could be wrapped in a crust and eaten as food, it could heal and feed the people at the same time, and because it was shaped like a human ear, it was named Jiao Er (娇耳). And because this food is in the New Year's time to eat, the New Year, the old year in the ZiHou, so named Jiaosi, and later in the "cross" word next to the word added a "food" character side, it became today's dumplings.