Soymilk big change

Today, when I go home from school, my mother said that we should eat tofu brains? I said yes. So we went to the market to buy two bags of soy milk and two bags of gypsum powder.

When I got home, Dad first poured the gypsum powder into a large bowl, then poured the soy milk into a large pot, boiled the soy milk, and saw a few round bubbles on the soy milk. Dad put the soy milk. Pour into the bowl where the gypsum powder is placed, then cover it. I am in a hurry, keep walking around, and ask my father like a repeater. Can I open it? In this way, I waited, the time finally arrived, my mother opened the lid, the bean berry turned into a body, and the white, tender tofu brain appeared in front of me, I shouted: Success! Successful! ”

I ate the fragrant tofu brain, and my head got a big question mark. Why can soy milk turn into a tofu brain? Who can tell me.

Second grade: An Xiangyu