Preheat the grill to medium high.

Melt the butter in a saucepan over medium heat. Stir in the garlic, salt, and beer. Turn off heat and allow to steep for ten minutes.

Cut the lobster tails in half, lengthwise. Clean out any vein that may still be there.

Place the lobster tails in the pot of butter for ten minutes, allowing to soak in the butter.

Remove from butter (reserve butter).

Place lobster tails on the grill, cut side down, close the lid. Cook until the tails turn bright red and the flesh has turned white, about five minutes. Turn the tails over, baste with the butter mixture.

Remove from the grill, serve immediately.