The method of unifying yuba is to grind soybeans, put them in a large pot and cook them into soybean milk, then pour the soybean milk into a flat pot with low fire, and take them out to dry after the soybean milk condenses into a sticky skin. And bean dregs become the first-class feed for pigs. Someone in Hanjiang, Putian came up with a wonderful idea, using soybeans to extract oil, and then crushing bean dregs with a crusher to make bean skin ... thus reducing the cost of Yuba!