Jiaozi, formerly known as "Joule", is a traditional noodle of Han nationality, which originated in the ancient corner of China and has a history of 1800 years. It was invented by Zhang Zhongjing, a native of Nieyang (now Dengzhou, Nanyang, Henan) in the Eastern Han Dynasty, and was originally used as medicine. Jiaozi, also known as jiaozi, is deeply loved by the people of China. It is a staple food for people in northern China, a local snack, and also a Chinese New Year food. There is a folk proverb called "Eat jiaozi for the New Year when it is cold." Jiaozi often cooks with flour and leather bag stuffing.