Rinse the crabs with clean water and put them in a container;

Put the minced ginger in a small wine bowl, add cooked soy sauce, white sugar, monosodium glutamate, rice wine, and sesame oil and stir. Take another small bowl and put vinegar in it for later use;

Put the crabs in the cage and steam them for 15-20 minutes until the crab shells turn bright red and the crab meat is mature, take it out. Serve with oil to taste and vinegar.