PM Update: Scattered showers and thunderstorms through the early evening. Much cooler on Monday. You may have to dodge some raindrops through about 8 tonight. A cold front moves through tomorrow morning and ushers in much more seasonable weather.
Only cook live crabs, because they deteriorate very quickly after they have expired. You can simply throw the crabs in a pot of boiling water to cook them. Depending on the size of the crabs, it will take between 6 and 10 minutes for them to cook thoroughly. If the crab is alive when you start, the amount of cooking time has very little to do with safety  it s more a question of whether the meat is underdone, overdone, or cooked just right.
Directions. Prep. Cook. Ready In. 1  Preheat an outdoor grill for high heat. 2  When hot, lightly oil grate. 3  Whisk together the olive oil, butter, and garlic; generously brush onto crab. 4  Cook crab on preheated grill, turning once, until the shell begins to brown, about 6 minutes.