This is a wonderful, easy, and tasty way to prepare tuna steaks on the grill. I remember the first time I ate a tuna steak, was at a restaurant in N.C., and it was slathered with this herb butter. I remember thinking, why ruin a beautiful tuna steak by adding all that fat, when it doesn't even need it to taste incredible! This marinade adds just the right amount of flavor without piling on the fat...which leads to packing on the pounds!!!