According to legend, when Zhang Zhongjing was the prefect of Changsha, he often cured diseases for the people.
One year, when the local plague prevailed, he built a cauldron at the entrance of Yamen, giving up medicine to save people, which won the love of Changsha people.
After Zhang Zhongjing retired from Changsha, he just happened to catch up with the winter solstice and walked to the bank of the Baihe River in his hometown. He saw many poor people suffering from hunger and cold, and their ears were frozen. It turned out that typhoid fever was prevalent at that time, and many people died.
He was very upset and determined to treat them. When Zhang Zhongjing came home, there were many people seeking medical treatment. He was as busy as a bee, but he always remembered the poor people with frozen ears.
Following the example of Changsha, he told his disciples to set up a medical shed and cauldron in an open space in Dongguan, Nanyang, and open it on the day of the winter solstice to give medicine to the poor to cure their injuries.
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How to cook jiaozi:
Quick-frozen jiaozi boiled in cold water. Quick-frozen jiaozi is easy to break the skin when boiled in boiling water, and the meat stuffing is not easy to cook. Boil jiaozi in cold water and quickly freeze it. With the increase of water temperature, jiaozi's dough and meat stuffing are heated more evenly, and the skin tastes stronger.
Fresh jiaozi boiled in boiling water. Jiaozi, who makes his own bags at home, must wait for the water to boil before cooking. When cooking jiaozi, put jiaozi into the pot while boiling water, and then gently push it in one direction with a spatula to prevent jiaozi from sticking to each other or the bottom of the pot.
The general saying is "cover the pot to cook the stuffing, not cover the pot to cook the skin". If jiaozi just put the lid on the pot and cooked it, the high temperature of steam would easily break the dumpling skin.
Jiaozi just after the pot, should first open the pot to cook. After the dumpling skin is cooked, the lid should be covered in time to cook the stuffing better. When jiaozi is about to rise to the surface and boil, uncover the boiled skin again.
Baidu Encyclopedia-jiaozi