Jiaozi, also known as dumplings, formerly known as Joule, is an ancient traditional pasta in China, which originated from Wancheng in the Central Plains and has a history of 1800 years. At that time, jiaozi was used as a medicine, and Zhang Zhongjing wrapped some cold-dispelling herbs in dough to treat diseases. Later, with the changes of the times, jiaozi gradually became food.