Flip up the “apron” at the back of the shell, and use your thumb to break it off.
Stick your thumb into the hole left from removing the apron, and lift up gently but firmly, to fully remove the carapace.
Remove and discard the spongy, inedible gills from either side of the body.
Also crack and remove the mandibles (mouthparts) at the front of the crab.
Rinse all of the greenish-brown goo out of the body so that you are left with only shell and tasty meat.
Turn the crab upside down, grip it on either side, and crack it in two.
Squeeze out the meat from each half.