Tuna with Tangy Onions

Ingredients

• 1 large onion, chopped
• 2 1/2 tablespoons olive oil, divided
• 1/2 cup red wine vinegar
• 1/2 teaspoon salt, divided
• 1/2 teaspoon pepper, divided
• 8 (3/4-inch-thick) tuna steaks (about 2 pounds)
• 1/2 cup all-purpose flour

Preparation

1. Saute onion in 1 tablespoon hot olive oil in a large skillet over medium-high heat 5 minutes or until lightly browned. Add vinegar, 1/4 teaspoon salt, and 1/4 teaspoon pepper. Continue cooking until most of the liquid evaporates (about 2 minutes). Remove onion mixture from skillet; keep warm. Wipe skillet clean with a paper towel.
2. Sprinkle tuna with remaining 1/4 teaspoon salt and remaining 1/4 teaspoon pepper; dredge in flour. Heat half of remaining olive oil in skillet over medium-high heat. Add 4 tuna steaks to skillet; cook 2 minutes on each side or to desired degree of doneness. Repeat procedure with remaining olive oil and tuna steaks. Serve with warm onion mixture.