Dousha Bao, also known as Dourong Bao, is a wheat bun filled with red bean paste, which originated from Beijing and Tianjin as a traditional snack. The practice of bean paste filling is to remove the skin of red beans, break them and boil them, add sugar, and then fry them in oil. Put the filling into a dough dough made of wheat noodles and cornflour and steam it in a steamer.