1. Tofu itself is a hot-processed food. Tofu is mainly used for disinfection or heating its interior. Normally, it takes 3-5 minutes after water boils, and 4 minutes is an ideal time.

2. In fact, there are many kinds of tofu, including brine tofu, gypsum tofu, lactone tofu and frozen tofu. Tofu is all cooked products, and it is also used for disinfection when it is heated again, especially when the water in the tofu is boiled dry, the taste of tofu will not be very good and it will taste very old.

3. Tofu is rich in protein, but the content of amino acids in protein is very low, so tofu is usually mixed with minced meat to make the nutrition more balanced. Tofu is soaked in preservation, so it is not easy to boil, especially tofu with high moisture content, which can be soaked in salt water before cooking.