1. In a large bowl, combine the oil, lemon juice, oregano, salt, pepper, and garlic. Add the steak cubes to the mixture and marinate for 20 to 25 minutes at room temperature. About 5 minutes before you are ready to cook the kebabs, preheat the broiler.
2. Remove the steak from the marinade and thread it onto 4 skewers. Broil 4 inches from the heat for 3 minutes on each side, basting occasionally with the marinade.