The soaking method of dry powder strips of hot and sour powder is as follows: firstly, take out the bought dry powder strips of hot and sour powder, soak them in cold water for about 30 minutes, then pour out the cold water, then pour warm water with a temperature of about 40-60 degrees into a basin and soak them for about 2-3 hours.

Vermicelli is a kind of traditional food, which is made of sweet potato and potato. And then processed by grinding and precipitation. Every place in China has its own unique production technology. The finished vermicelli is grayish white, yellow or yellowish brown, which can be divided into round vermicelli, fine vermicelli and wide vermicelli according to its shape.