First, don’t thaw them. Really. Just toss them in frozen. It adds about 5 to 7 extra minutes to the total time.
Frozen blue crabs? Give them 30 to 35 minutes. Frozen Dungeness? Add 10 minutes to the clock. Why? Because ice is a sneaky little villain that steals heat.
But here’s the secret: steaming from frozen keeps the meat tighter. Some people swear by it. Try it once—you might become a convert.