Zhang Zhongjing is a native of Gedong, Nanyang. He wrote Treatise on Febrile Diseases, which is a masterpiece of doctors and is regarded as a classic by doctors of all ages. Zhang Zhongjing has a famous saying: "If you advance, you will save the world; if you retreat, you will save the people;" You can't be a good doctor, but also a good doctor. " In the Eastern Han Dynasty, he served as the prefect of Changsha, visiting the sick and applying medicine, and practicing medicine in the lobby. Later, he resolutely resigned and returned to his hometown to treat his neighbors. When he returned home, it was winter. He saw that the villagers on both sides of the Baihe River were sallow and emaciated, hungry and cold, and many people's ears were frozen. He asked his disciples to set up a medical shed and a cauldron in Dongguan, Nanyang, and give up "Quhan Jiaoer Decoction" to cure chilblain on the day of the winter solstice. He boiled mutton, peppers and some herbs for dispelling cold in a pot, then fished out the mutton and medicines and chopped them, and made them into ear-like "jiao-er" with bread. After cooking, he distributed two "jiao-er" and a big bowl of broth to everyone who came to ask for medicine. People ate "Jiao Er" and drank "Quhan Tang", and they were warm all over, with fever in both ears and frostbitten ears cured. Later generations learned the look of "Jiao Er" and packaged it into food, also called "jiaozi" or "flat food".
Eating jiaozi on the winter solstice is the kindness of Zhang Zhongjing, a "medical sage", in "Quhan Jiaoer Decoction". Up to now, there is still a folk song in Nanyang, which says, "The winter solstice misbehaves the jiaozi bowl, and nobody cares if you freeze your ears.".
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