Sloppied Flank Steak Sandwiches

Ingredients (11)

• + 1 ½ pounds beef flank steak add to pantry
• + 1 tablespoon steak seasoning (such as Montreal Steak Seasoning®) add to pantry
• + 1 tablespoon olive oil add to pantry
• + ¼ cup brown sugar add to pantry
• + 1 small onion, chopped add to pantry
• + 1 small red bell pepper, chopped add to pantry
• + 1 tablespoon apple cider vinegar add to pantry
• + 1 tablespoon Worcestershire sauce add to pantry
• + 2 cups tomato sauce add to pantry
• ✓ 2 tablespoons tomato paste
• + 6 hamburger buns, split and toasted add to pantry