According to legend, there were two gangs, Cao Gang and Yan Gang, at Caohe Wharf in Song Dynasty. Caobang takes grain transportation as its business, while Yanbang takes salt transportation as its business. In order to dominate the dock, the two sides often went to war, and finally they won the game with Cao Gang. The donkey captured by Cao Gang and loaded by Salt Gang could not be handled, so it was slaughtered, stewed and held a celebration banquet. It is more delicious to eat the meat in a local fire. Since then, Caohe donkey meat has risen and famous food has been born. Since then, the local custom of eating donkey meat by fire has been formed, and a set of exquisite processing techniques for cooking donkey meat have been gradually explored. After the death of Zhu Yuanzhang, the founding emperor of the Ming Dynasty, his descendants fought in the same room. Zhu Di, the fourth son of Zhu Yuanzhang, sent troops to fight with Zhu Yunwen, the heir of Zhu Yuanzhang, Ming Huidi. Zhu Yunwen sent generals Li Jinglong and Zhu Di to fight in Baigou River area, and Li Jinglong was defeated and retreated to Caohe Town, Xu Shui. The army was short of food, so Li Jinglong had no choice but to order the sergeant to kill the charger to satisfy his hunger. The local people have the custom of eating donkey meat, so the cooked horse meat is especially fragrant. Since then, cooking horses for food has become a custom in Caohe Town, Xu Shui, and the prepared horse meat is delicious. In the Qing Dynasty, Kangxi attached importance to agriculture and mulberry, forbidding the slaughter of cattle and horses, and the scholars in Caohe changed to the custom of eating horse meat and only ate donkey meat; Plus, donkeys are cheaper than horses, so people specialize in raising donkeys to eat. Then there is the local baked fire, which is tender in the outside, and the small donkey meat cooked on the freshly baked fire has become a famous local food. According to legend, Emperor Kangxi went out of Beijing incognito for a private visit. After having a meal in Zhuozhou, the first state in the world, he went all the way to Caohe Town. At this time, he felt hungry, and saw small restaurants on the roadside selling donkey meat and burning it. Kangxi doesn't know why donkey meat burns. He was very curious, so he asked the eunuch to buy donkey meat and burn it to satisfy his hunger. Kangxi lived in the court all day. How could he have eaten this donkey meat fire? After he ate donkey meat and burned it, he felt that the tender meat, crisp and soft fire was extremely delicious, calling it delicious. When Kangxi returned to Beijing Palace, he still remembered the burning smell of donkey meat he had eaten in Caohe Town. He asked the court chef to cook donkey meat for him. The chef carefully made several times for Kangxi, and Kangxi felt that the donkey meat he ate in Caohe Town was not the same taste. Not as good as the donkey meat he ate in Caohe Town. Kangxi had to send someone to Caohe to buy donkey meat from Caohe and burn it. Since then, the burning of donkey meat in Caohe, Xu Shui has gained a good reputation in Beijing.