Steak Fajitas

(Preparation Time: 15 minutes | Cooking Time: 8-11 minutes | Servings: 6-7) Ingredients : Lime wedges and sliced avocado and (as required) 6 whole warmed wheat tortillas (8 inches) 1 beef flank steak (approximately 680 g) 2 large tomatoes, seeded and chopped 1 jalapeno pepper, seeded and minced 1 large onion, halved