- 1 (8 ounce) flat iron steak, or to taste
- 2 pinches salt and coarsely ground pepper to taste
- 1 red onion, chopped
- 2 cloves garlic, minced
- 2 tablespoons Worcestershire sauce (such as Lea and Perrins), or as needed
Season steak with salt and pepper and place in a resealable bag. Add onion, garlic, and enough Worcestershire sauce to cover bottom of steak. Coat steak with the marinade, squeeze out excess air, and seal the bag. Marinate in the refrigerator for 24 hours, shaking periodically to coat steak.