Preheat a grill or an oven broiler.
Place the lobsters in boiling water for 6 to 8 minutes, 4 minutes for every pound. Make sure not to overcook the lobsters. Split the lobsters in half from head to tail and rinse out the gut material. Lightly brush melted butter on to the meat side of the lobster and broil in the oven meat side up or on a grill, meat side down. Cook the lobsters until lightly browned on the meat side.