Put the crab's abdomen upward and you will see a triangle (male crab) or an oval shape (female crab). Pry it open from the tip to the root connection and break it. At this time, you can pull it forward from the tail. When the shell is opened, except for the crab roe, other internal organs are inedible, such as the gills (thin strips, divided into two sides), the intestines and stomach (extending from the mouth, the stomach is diamond-shaped), all are removed and washed, and the crab shell is covered back. It’s ready to be steamed.