Steamed river crabs are the best in the season. Help yourself and buy two for each person. It's no use eating more. You can buy a fist as big as a man's and a woman's in 30 yuan. Remember to buy a cat's paw and let the boss tie it with a rope. When you go back, put one-third of the water in the rice cooker, then put a small bowl with a plate or a big bowl on it, and then turn on electricity to boil water. Brush dogs, men and women with discarded toothbrushes, boil and steam on a plate for eight minutes. At this time, you can't just wait. Find a piece of ginger, chop it into pieces and put it in a small bowl. Then add two or two meters of vinegar, a spoonful of sugar (don't put it unless it is sweet) and a little soy sauce and mix well. As soon as the medium-rare crab arrives, take it out and steam it in a small bowl of ginger vinegar for two minutes. I think it will be done in 20 minutes.