Beef and mutton paomo is a unique and famous snack in Xi 'an Anfangbang. According to relevant research, the beef and mutton steamed buns evolved from the ancient "beef mutton soup" in 1 1 century BC. There is also a funny legend that Zhao Kuangyin, the emperor of the Song Dynasty, was trapped in Chang 'an before he proclaimed himself emperor and lived a life of starvation all day. One day, he came to a shop where beef and mutton were being cooked. The shopkeeper felt sorry for him, so he let him break up his dry steamed buns, then poured him a spoonful of hot soup and baked it thoroughly on the fire. Zhao Kuangyin wolfed down his food and thought it was the best food in the world. Later, Zhao Kuangyin put on a yellow robe and became an emperor. One day, he passed by Chang 'an and remembered the beef and mutton steamed buns he had eaten here in those years. Wu purposely found this store to eat beef and mutton bread in soup, and thought it was still delicious, even more delicious than delicacies, so he rewarded the shopkeeper of this store. Once the story of the emperor eating steamed buns spread, beef and mutton became a famous snack on Chang 'an Avenue. Su Dongpo, a great writer in the Northern Song Dynasty, once wrote a hymn titled "Dragon has bear wax, Qin only cooks mutton soup".