Bean paste buns, also known as bean paste buns, are wheat buns filled with red bean paste. They are a Han snack originated in Beijing and Tianjin. The method of making red bean paste filling is to remove the bean skins from red beans, mash them and boil them, add sugar, and stir-fry them in oil. Put the stuffing into a dough made of flour and cornstarch and steam it in a steamer.