There are countless small holes of different sizes in fresh tofu, some of which are connected with each other, and some are closed into small containers, which are full of water. Water has a strange characteristic. At 4℃, its density is the largest and its volume is the smallest. At 0℃, water becomes ice, and its volume is not shrinking but expanding, which is about 10% larger than that at normal temperature.
When the temperature of tofu drops below 0℃, the water in it becomes ice, and the original pores are enlarged by the ice, and the whole piece of tofu is squeezed into a net. When the ice melts into water and flows out of the tofu, many holes are left. This makes tofu honeycomb-shaped, with many pores, gray in color, easier to cook and more delicious.
Extended data
Matters needing attention in eating tofu
1, tofu can't be eaten with spinach, spinach contains calcium oxalate, and tofu and spinach are eaten together, which is not conducive to the absorption of calcium by the human body.
2, tofu can not be eaten with honey, honey promotes digestion, moistening intestines is very good, and eating with tofu can easily lead to diarrhea.
3, tofu can not be eaten with water bamboo, and it is easy to form gallstones. Tofu can be paired with lettuce, which is conducive to weight loss and bodybuilding; Tofu can be matched with Flammulina velutipes, which is beneficial to enhance resistance; Tofu can be paired with kelp to help prevent iodine deficiency and so on.
4. Tofu is rich in protein. Eating too much at one time not only hinders the absorption of iron, but also easily causes protein indigestion, abdominal distension, diarrhea and other uncomfortable symptoms.
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