Hot and sour noodles are a traditional Han snack widely spread in urban and rural areas of Chongqing and Sichuan Province and belong to Sichuan cuisine. Because of its low price and good quality, it has been loved by people for a long time. Its characteristics are "numbing, spicy, fresh, fragrant, sour and oily but not greasy"! Known as "the best fan in the world". Hot and sour noodles are a pure green food. The main powder is made from sweet potatoes, sweet potatoes and peas in the best proportion, and is then made by farmers using traditional hand-made techniques. "Hot and Sour Noodles" has been selling extremely well in major cities across the country due to its unique advantages of low price, good quality and taste, and has even achieved impressive results in Jiefangbei, Chongqing.