Lobster tails should be thawed completely (approximately 24 hours in refrigerator before re-heating. To steam, place in a pot with 2 inches of water and steam for 5-10 minutes. To broil, remove the soft undercover of the tails with scissors. Slightly crack the upper shell so that the tails will lie flat. Arrange on broiler or grill shell down. generously brush lobster meat with garlic butter. For 8-10 ounce lobster tails, cook 15-20 minutes, turning halfway through.