Use gypsum to order tofu. This kind of tofu is called tender tofu. It must be soaked in water before cooking, otherwise it will break and lose water. Use brine. The brine before ordering tofu is poisonous. The difference in taste is that gypsum tofu is a little sour, and salted tofu is a little salty. Gypsum can lower blood pressure, but eating too much will cool blood, and the gypsum source of gypsum tofu seems to be not so clean.