Flank Steak Sandwiches - Master recipes

Ingredients

• 1 cup chopped onion -
• 1 cup dry red wine or beef broth -
• 3/4 cup reduced-sodium soy sauce -
• 1/2 cup olive oil, divided -
• 4-1/2 teaspoons minced garlic, divided -
• 1-1/2 teaspoons ground mustard -
• 1-1/2 teaspoons ground ginger -
• 1 beef flank steak (1-1/2 pounds) -
• 1 medium sweet red pepper, cut into 1-inch strips -
• 1 medium sweet yellow pepper, cut into 1-inch strips -
• 1 medium red onion, thickly sliced -
• 1/4 teaspoon pepper -
• 6 French rolls, split -