Tofu brain and tofu belong to the same family, but there are some differences, that is, tofu is solidified and tofu brain is semi-solidified juice. The production process of tofu is as follows: firstly, the washed soybeans are ground into tofu, peeled, soaked in clear water for about 4 hours, then taken out when the tofu swells and turns white, poured into a refiner or a stone mill to grind into fine soybean milk, filtered with cloth, poured the juice from bean dregs into an iron pan, boiled with strong fire, then poured into a special bucket, then melted the plaster of Paris with clear water, put it into a crock, and poured the soybean milk in the bucket for about 5 minutes while it was hot.