In a small bowl stir together the garam masala, the salt, and the pepper, in a shallow dish rub the mixture onto both sides of the steak, and let the steak stand at room temperature for 30 minutes. Grill the steak on an oiled rack set about 5 to 6 inches over glowing coals for 8 to 10 minutes on each side for medium-rare meat. (Alternatively, the steak may be broiled under a preheated broiler about 3 inches from the heat for 8 to 10 minutes on each side.) Transfer the steak to a cutting board and let it stand for 10 minutes. Holding a knife at a 45 degree angle, cut the steak across the grain into thin slices. Serves 4 to 6.