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Grill the tuna steaks. Tuna steaks will usually need to cook for roughly 4 to 6 minutes per 1/2-inch (1.27-cm) thickness. Turn once in the middle of the cooking process to promote even cooking.1  Leave the grill uncovered if using charcoal but cover it if using gas.una steaks will usually need to cook for roughly 4 to 6 minutes per 1/2-inch (1.27-cm) thickness. Turn once in the middle of the cooking process to promote even cooking. 1  Leave the grill uncovered if using charcoal but cover it if using gas.
Answers. Best Answer: Here is one way of cooking the tuna in the oven. Pour 3 tbsp extra virgin olive oil over steaks. Place 1 sliced lemon on top as well as a couple of garlic cloves, 1 sprig of rosemary, and 1 sprig of oregano.