Flat Iron Steak Fajitas with Tomato & Avocado Salsa – Omaha Steaks Posted in Steak Flat Iron Steak Fajitas with Tomato & Avocado Salsa is an easy recipe the whole family will love. Start with our flavorful marinade and cook the steak to the perfect doneness in a skillet. Serve on tortillas and top with homemade salsa.