Sour tofu is a part of the Tianjin soybean series. The sour sauce is a little spicy in the sweet taste of the vegetables. Cooking sour sauce, vinegar and white sugar are necessary, reflecting the unique local nature of Tianjin ' s food style, which is mainly salty and light, supported by sour sweets, spicy little sis, complex cooking. The sour salves are represented mainly by sour crabs, sour saloon fish, etc. Sour tofu is one of them. The sour soybean is a very good sour sauce, especially for the spring table, even though it is not a river and sea fresh, and it is heard that sour soybeans, such as the sour crabs, which use both of the river and sea as food, are high. Tofu's rot is the same as the blessing of a new year's blessing. Spicy sour tastes can stimulate buds and enhance the appetite of families during holidays。