Thaw lobster tails in the refrigerator if frozen
Fill a pot with 1 to 2 inches of water
Add a steamer basket or insert above the water
Bring the water to a boil
If desired, split the top shell of each tail with kitchen shears
Place lobster tails in the steamer basket
Cover the pot tightly
Steam until the meat is opaque and firm
Steam for about 6 to 8 minutes for 4 to 6 ounce tails
Steam for about 8 to 10 minutes for 6 to 8 ounce tails
Steam for about 10 to 12 minutes for larger tails
Remove from the pot with tongs
Serve immediately with melted butter if desired