Making dough, commonly known as "facial cleanser". Firstly, mixing flour, kneading into smooth dough, gently kneading with clear water, washing to separate starch from gluten, then precipitating and filtering, leaving thick slurry mixed with proper amount of ash or alkali, scooping into a flat plate, and steaming in a cage; Gluten is also steamed in a cage, and once steamed, it forms pores, such as sponges. When eating, cut a large piece of dough into finger-wide strips, put it in a sea bowl, cover it with a few pieces of gluten, and pour it with vinegar, garlic, red oil and mustard, which is fragrant.