Recipes Red Wine Vinegar Marinated Flat Iron Steak Be the first to rate & review! The flat iron steak, which sits on the shoulder blade next to the teres major, is great for marinating and grilling.Plus: Food & Wine’s Grilling Guide By Food & Wine Updated on September 10, 2015 Print Rate It Share Share Tweet Pin Email Total Time: 25 mins Yield: 2 Ingredients One 1-pound beef flat iron steak Salt Freshly ground black pepper 1/4 cup extra-virgin olive oil 3 tablespoons red wine vinegar 1/2 teaspoon crushed red pepper 1/4 cup chopped parsley Vegetable oil, for brushing Directions Season the steak lightly with salt and pepper. In a resealable plastic bag, combine the olive oil, vinegar, crushed red pepper and parsley. Add the steak to the bag and turn to coat completely with the marinade. Refrigerate, turning occasionally, for at least 6 hours and up to 12 hours. Remove the steak from the marinade and bring to room temperature. Light a grill or preheat a grill pan and brush with vegetable oil. Season the steak with salt and pepper and grill over moderately high heat until well-browned outside and medium-rare within, about 3 1/2 minutes per side. Transfer to a carving board and let rest for 5 minutes. Thinly slice the steak against the grain and serve. Rate it Print