How to Make It
Light the grill or heat the broiler. In a small bowl, combine the butter, anchovy paste, lemon juice, parsley, and a pinch each of salt and pepper.
Coat the tuna with the oil. Sprinkle with 1/2 teaspoon salt and 1/4 teaspoon pepper. Cook the tuna for 4 minutes. Turn and cook until done to your taste, 3 to 4 minutes longer for medium rare. Top the hot fish with the flavored butter.
Fish Alternatives The lemon anchovy butter would also be very good with grilled halibut, swordfish, or salmon steaks. Variation Grilled Tuna with Sun-Dried-Tomato Basil Butter: Mix 1 tablespoon chopped fresh basil, 3 chopped oil-packed or reconstituted sun-dried tomatoes, and a pinch each of salt and pepper into 4 tablespoons room-temperature butter. Use this mixture in place of the lemon anchovy butter.