Meat folder, also known as wax sauce, is a famous snack in Shaanxi, China. The meat used in meat minced meat is bacon meat. It is a kind of pork cooked in a large pot. When cooking, the soup has a thick layer of oil on the broth for heat preservation and fragrance. After cooling, the oil is white, such as wax, and the lean meat is also like wax soaked in the name of the sauce. This meat is similar to the sauce but is more succulent than the general sauce. The 馍 used is 白 饼 , , , , , , , , , , , , , , , , , , , , , , 白 白 白 白 白 白 白 白 白 白 白 白 白 白 白 白 白 白 白 白 白 白 白 白 白 白. Because the meat folder is similar in shape to the hamburger, it can be traced back to the pre-Qin period (its meat can be traced back to the Zhou Dynasty, while the bread portion can be traced back to the Qin Dynasty), so it is considered to be the earliest in the world.