Tuna with tomatoes and basil
Description
In a skillet, heat 1 1/2 tablespoons of oil over medium heat. Season the tuna with salt and pepper. Arrange half of the tuna in the skillet in a single layer. Cook, turning once, until golden brown on both sides, about 1 1/2 minutes per side (3 minutes total). The tuna should still be slightly pink in the center. Transfer to a plate and cover to keep warm. Add another 1 1/2 tablespoons of oil and cook the remaining tuna. Wipe out the skillet. Add the remaining 2 tablespoons of oil and the onion. Cook over medium heat, stirring, until the onion is golden brown and soft, 4 to 6 minutes. Add the tomatoes and wine, bring to a simmer, and cook, stirring frequently, for about 2 minutes. Continue cooking until the sauce thickens slightly, about 5 minutes. Stir in the basil and cook, stirring, for 1 minute. Season with salt and pepper. Spoon the sauce over the tuna and serve.