"One Hundred Stories of the Old City" said: "Mutton pot is the most common delicacy in cold years, so you must eat it with mutton restaurant. This way of eating is the research and evolution of the nomadic legacy in the north and has become a special flavor. " In A.D. 1854, Zhengyang Building outside Qianmen, Beijing opened, which was the pioneer of selling instant-boiled mutton in Hanmin Pavilion. Its cut meat is "as thin as paper, without exception", which makes this delicious food more famous.