Preheat charcoal grill or stovetop grill pan. Season the steak with salt and pepper. Grill the steak for 2 to 3 minutes per side or until cooked to desired degree of doneness. Transfer the steak to a cutting surface and allow to stand for 5 to 8 minutes. Cut steak across the grain into thin slices or chop into 1 cm pieces. Serve immediately with warm tortillas and accompaniments.