Good baked tuna steak recipes include Serious Eat's oven-baked tuna with a savory topping, Jacques Pepin's slow-cooked tuna steaks with tomato relish, and Maltese baked tuna from Food.com. Spicy tuna steaks featured on About.com are cooked in a standard oven, but are broiled rather than baked.
To make Jacques Pepin's slow-cooked tuna steaks with tomato relish, cook the meat for 20 minutes at 200 degrees Fahrenheit. Meanwhile, combine 3/4 cup of peeled, diced tomatoes, 1/2 cup chopped onions, 3 tablespoons chopped chives and 1/4 teaspoon of salt in a bowl with 1/3 cup of fresh salsa. Season with 3 tablespoons each of extra-virgin olive oil and fresh lime juice. Serve the steaks topped with the relish.
Bake spicy tuna steaks by starting with a marinade made from 1/4 cup of vegetable oil, 2 tablespoons soy sauce, 3 tablespoons lemon juice, 1/4 teaspoon dry mustard and 4 minced garlic cloves. Season with 1/2 teaspoon black pepper, and place in a shallow container with 2 pounds of tuna steaks. Marinate the fish for up to an hour, then place the meat on a broiler pan, and broil for up to five minutes on each side. Garnish with freshly cut lemon wedges before serving.