steam the blue crabs for 15 minutes. Here's how to do it: Materials: 1 blue crab, 1g shredded ginger, proper amount of garlic powder, 5ml of sesame oil, 5g of sugar and 1ml of yellow wine. 1. Take out the bought blue crabs and brush their shells with clean water. 2. pry open the belly of the blue crab with a knife at the bottom of the blue crab. 3. Pick out the crab gills by hand and throw them away. 4. Peel the blue crab and rinse it with clear water for use. 5. The whole roasted crab is also washed with clear water for later use. 6. Put the processed blue crab into a dish and put shredded ginger on the blue crab. 7. Add garlic, sugar and sesame oil to the blue crab, and drizzle with yellow wine. 8. Cover the crab and steam for 15 minutes. After 9.15 minutes, the blue crab can be put out of the pot and eaten.