Tofu is rich in amino acids and protein, and it is a good supplementary food for cereals. Tofu fat is 78% unsaturated fatty acid and contains no cholesterol. Vegetable meat? Good name. The digestion and absorption rate of tofu is above 95%. Two small pieces of tofu can meet a person's daily calcium demand.
So how is tofu made? Taking tofu making in South China as an example, it is divided into the following steps:
Step 1: Soybean is the main material for making tofu. First, dry soybeans are crushed by a special machine, filtered by a sieve to remove fine powder, and then shelled. Soybean is 1 1.5 kg.
Step 2: put it in a bucket and soak it in clean tap water or well water for more than 4 hours, usually one night. The next morning, after soaking, it is estimated that there are 30 kilograms, and then it is ground into soybean milk powder by machine.
Step 3: Boil the water with firewood to 100℃, and the water quantity is 1. Add about150kg of water to the cauldron. After the water is boiled, mix in the soybean milk powder, put it in a vat and cool it for about 30 minutes. Put a rack on the cauldron and a burning dustpan on it, spread wet pure white cotton cloth, scoop out the soybean milk and filter it, separate the soybean milk from the residue, and filter the slurry into the cauldron.
Step 4: After the soybean milk powder is filtered into the cauldron, it is heated to 100℃ and 1 with wood fire. Usually leave a ladle of cold slurry mixed with boiled water slurry before cooking to prevent it from tumbling and overflowing, so as not to fill the cauldron with boiled water slurry; 2. Leave a spoonful of cold slurry mixed with gypsum powder.
Step 5: scald the pulp to 100℃, then scoop it into a vat and cool it. Stir 0.4 kg of crushed gypsum powder into the cold slurry (about 2 kg for half a ladle) and mix well. When the pulp is cooled to about 50℃, it is mixed with gypsum powder, and the pulp is scooped to the tofu block with a spoon or climbed to the tofu block with a hot spoon. This step is crucial.
Step 6: After the tofu comes, separate the tofu from the water, that is, the water separated after 10 minutes is green water, which is called secondary water, and then filter it.
Step 7: Filtering: Before filtering, put a clean tofu box on the board, spread wet pure cotton cloth in the tofu box, and take out all the tofu and put it in the box. Cotton cloth is stacked on tofu in four directions until all layers of tofu are wrapped and covered with box covers to ensure safety. The weight or bricks are evenly stressed on the box cover to ensure safety. Usually, the tofu is filtered for 4hr∽6hr until the water of the tofu man is filtered out by more than 80%, and then the tofu is cut into small pieces.
Old people in rural areas usually like to eat tofu by themselves. It was really fun!