HEAT grill to medium heat.
MIX first 3 ingredients.
GRILL steak 5 min. on each side or until medium doneness (160ºF), brushing occasionally with steak sauce. Remove steak from grill; cover. Let stand 5 min. Cut steak across the grain into thin slices.
COVER platter with lettuce; top with tomatoes, onions and meat. Drizzle with dressing mixture. Sprinkle with cheese. Serve immediately.