Roujiamo (肉夹馍) is considered the Chinese equivalent to the Western hamburger and meat sandwiches, it is a street food originating from Shaanxi Province in China. It is also made famous by Xi'an Famous in New York City a couple of years back.
The flatbread used for this sandwich is called "Bai Ji Mo” (白吉馍), which is made from wheat flour first toasted on flat pan and then baked in a clay or mud oven. A good Bai Ji Mo is said to be crusty on the outside and soft in the inside.
The stewed meat is most commonly pork, stewed for hours in Master Stock, it is later chopped and stuffed into the flatbread, served with a little gravy from the stew (腊汁), thus this Chinese Stewed Pork Burger is also called “腊汁肉夹馍” which means Chinese Stewed Pork Burger with gravy.