1In a large pot with strainer or drainer insert, bring 3-4 cups of water to a boil. (Water amount may vary, but just keep below the level of the strainer or drainer portion of the pot.)
2Rinse ice from frozen crab legs, and place in the strainer or drainer inserted in the pot. Sprinkle the old bay seasoning on the crab legs and cover.
3Steam crab legs for 4 to 6 minutes or until heated through.
4Serve crab legs with butter for dipping.