Thaw frozen king crab legs in the refrigerator overnight or under cold running water
Rinse the crab legs under cold water
Fill a large pot with 2 to 3 inches of water
Add a steamer basket if using
Bring the water to a boil
Place the crab legs in the steamer basket or into the pot
Cover the pot
Steam for 5 to 7 minutes if thawed
Steam for 10 to 12 minutes if frozen
Remove the crab legs from the pot
Let them cool for 1 to 2 minutes
Crack the shells with kitchen shears or a crab cracker
Serve with melted butter and lemon wedges