Tuna with Tomato-Caper Sauce

Ingredients

• 1 onion (8 oz.), peeled, halved lengthwise, and thinly sliced
• Salt and pepper
• 1 can (14 1/2 oz.) crushed tomatoes in purée
• 1 tablespoon drained capers
• ½ cup dry red wine
• 1 teaspoon dried oregano
• 2 tuna steaks (such as albacore or yellowfin; each about 6 oz. and 1 in. thick)
• + 2 more ingredients
• • 3 tablespoons balsamic vinegar
  • 1 tablespoon olive oil

1. Rinse tuna steaks and pat dry. Sprinkle lightly all over with salt and pepper. Pour oil into a 10- to 12-inch nonstick frying pan over high heat. When hot, add onion and stir frequently until limp, about 5 minutes.

2. Push onion to side of pan and add tuna steaks. Cook, turning once, ...

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