To make grilled tuna steak, start with four 1-inch fresh tuna steaks, or the equivalent of 4 pounds. Bring a charcoal grill or cast iron grill to a high heat. Brush the steaks with olive oil, and add salt and pepper to taste. Grill each side for 2 to 2 1/2 minutes. The center should still be raw as in sushi, or it may become dry and tough. Allow the steaks to rest for 5 to 10 minutes before serving.
Another method for grilling tuna steaks is to combine 1/4 cup of olive oil with 4 teaspoons Old Bay seasoning and 2 teaspoons each of fresh lemon and lime juice. Mix all the ingredients well, and pour over about 1 pound of tuna steaks. Heat the grill to a high heat, place the steaks on the hottest part, and sear them for 1 to 2 minutes per side. This seals in the juices. Finish cooking the steaks by placing them slightly away from the hottest section, and grill 8 to 10 minutes per inch of thickness.
Tuna is a dense fish that is not too high in fat and has a light flavor. It blends well with basic seasonings and is tender when served rare or medium rare.