Beef Steak Fajitas

1 tablespoon + 1 teaspoon vegetable oil
1 tablespoon red wine vinegar
1/2 teaspoon dried oregano
1/2 teaspoon salt
1/8 teaspoon freshly ground pepper
1 beef flank steak (1 1/4 pounds)
1 red bell pepper, cut in half and seeded
1 yellow bell pepper, cut in half and seeded
1 large onion, sliced thickly
12 flour tortillas

1. Preheat grill or broiler. Combine 1 tablespoon oil, vinegar, oregano, salt, and pepper in plastic resealable bag. Add flank steak and marinate 15 minutes. 2. Brush peppers and onion with remaining 1 teaspoon oil. Cook 5 minutes per side. Cook beef 5 to 6 minutes per side for medium-rare. 3. Warm tortillas according to package directions. Slice peppers. Thinly slice meat against the grain. To serve: Place slices of beef, peppers, and onions in tortillas and garnish with cilantro, sour cream, tomatoes, and salsa.

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