Prep Time: 15 Minutes
Cook Time: 25 Minutes
Total Time: 40 Minutes
1. In a large shallow dish, whisk together the olive oil, Worcestershire, lime juice, garlic, cumin, chili/pepper flakes, salt and sugar until combined. Pour half of the marinade over the beef fillets, turning them to coat evenly. Add the capsicums/peppers with the onion to the remaining marinade and coat evenly. Cook immediately OR marinade for 1-2 hours in the refrigerator (or overnight) for a deeper flavor.
2. Heat a pan (cast iron) or heavy skillet over medium-high heat and drizzle in 2 teaspoons oil. Add the capsicums/peppers and onion and fry for a few minutes, until they're cooked but still crunchy and vibrant in color and have nice, chargrilled marks on them. Remove to a warm plate and set aside.
3. In the same pan over high heat, add a little extra oil (to prevent sticking), and fry the meat in batches until cooked to your liking. Remove and allow to rest on a cutting board for 5 minutes, and then slice thinly.
4. Preheat grill/sandwich press and prepare sandwiches with the capsicums/peppers and onions, steak slices, Greek yoghurt/sour cream, avocado slices, cheese and coriander/cilantro leaves. Place them into the grill/press and cook until warm and cheese has melted through.
Serve with limes, extra Greek yogurt/sour cream and salsa!