Rub cumin over meat. Season with salt and pepper, if desired. Grill or broil meat to desired doneness. (6-8 minutes for medium rare; 8-10 minutes for medium; 10-12 minutes for well done, turning once).
Combine tomatoes, corn, salsa, green pepper and onion. Thinly slice meat and serve over vegetables. Serve with lime wedges and cilantro, if desired.