Introduction of crab knowledge: Crab is delicious in food, which is known as the folk saying that "a plate of crab is the best dish". It is not only delicious, but also nutritious, and it is a tonic with high protein. According to the origin, it can be divided into three types: Eriocheir sinensis, Eriocheir sinensis and lake crab. The crabs produced in Hebei and Tianjin are the most famous, the crabs produced in Nanjing are the best, and the quality of lake crab produced in Yangcheng Lake in Changshu, Jiangsu and Weishan Lake in Shandong is better. There are a lot of crabs from August to September, especially when sorghum is red, which is the best time to eat crabs. There is a saying that "seven points and eight circles". The crab's head and breastplate are round, brown-green, with long and dense claws, flat and long sides and sharp tips. The crab meat is white and tender and delicious. Nutritional analysis of crabs: crabs are rich in protein and trace elements, which have a good nourishing effect on the body. Crabs also have anti-tuberculosis effects, and eating crabs is of great benefit to the rehabilitation of tuberculosis. Crabs are suitable for people: the general population can eat 1. It is suitable for traumatic injury, broken tendons and bones, swelling and pain due to blood stasis, puerperal placenta residue, weak pregnant women in labor, and retained afterbirth, especially for crab claws. 2. People who usually suffer from spleen and stomach deficiency, loose stool, abdominal pain, cold and cold, persistent wind disease and intractable skin itching are not suitable for eating; 3. Women with menorrhagia, dysmenorrhea and pregnancy should not eat crabs, especially crab claws. The therapeutic effect of crabs: crabs are cold and salty, belonging to the liver and stomach meridians; Has the effects of clearing away heat and toxic materials, tonifying bone and marrow, nourishing tendons and bones, promoting blood circulation and resolving phlegm, promoting diuresis and eliminating jaundice, benefiting limbs, nourishing liver yin and invigorating gastric juice; It has a certain therapeutic effect on congestion, jaundice, lumbocrural pain and rheumatoid arthritis. Crab foods are similar: crabs should not be eaten with sweet potatoes, pumpkins, honey, oranges, pears, pomegranates, tomatoes, cantaloupes, peanuts, snails, celery, persimmons, rabbit meat and Schizonepeta; Eating crabs without cold drinks will cause diarrhea. Guide to crab practice: 1. When cooking crabs, it is advisable to add some perilla leaves and fresh ginger to detoxify crabs and reduce their coldness. Crabs can be steamed, boiled, fried or made into snacks. 2. When steaming crabs, tie them up to prevent the legs from falling off and yellowing after steaming. When the raw crab is shelled, it should be scalded with boiling water for 3 minutes first, so that the crab meat can be easily removed and not wasted. 3. After buying crabs, put them in clean jars, add two broken eggs with brown rice, then sprinkle two black sesame seeds on the crab cover, and then cover the jar mouth with cotton cloth to make the air circulate, but not make the crabs see the sun. Take it out like this for about 3 days. Because crabs absorb nutrients from rice and eggs, their bellies are firm and full, and the number of repetitions is obviously increased. They are delicious and delicious. 4. Crabs are vulnerable to the wind and are not easy to eat cold food; Besides, don't eat dead crabs.