Place fish steaks in a well greased wire grill basket. Combine oil, butter and soy sauce. Brush some over fish. Grill fish steaks over medium hot coals 4 minutes. Turn grill basket. Baste fish again with remaining soy mixture. Grill 3-4 minutes more or until fish just flakes with a fork. Serve with lemon or lime wedges, if desired. Makes 4 servings.
To broil: Preheat broiler. Place steaks on greased unheated rack of broiler pan. Combine oil, butter and soy sauce. Brush some of mixture over fish. Broil 4 inches from heat for 4-6 minutes (no need to turn) until fish just flakes with a fork, brushing occasionally with remaining mixture.