These fajitas are a crowd-pleaser and perfect for a casual dinner party. The flank steak is marinated in a mixture of lime juice, garlic, and spices, then grilled and sliced thin. Serve with warm tortillas, sautéed peppers and onions, and all your favorite toppings like guacamole, salsa, and sour cream. This dish is easy to customize and can be made as spicy or mild as you like.