Question: how to cook frozen fully cooked crab legs?
Answer: Bring a large pot of water to a strong boil before dropping in the crab. Cover the pot; bring it back to a gentle simmer, and let it cook for 8 to 9 minutes. If the crab is fully thawed, 4 to 5 minutes is sufficient. Boil king crab for approximately 10 minutes if thawed, and a few minutes longer if frozen.