PREHEAT grill to medium. Mix marinade and 1/4 cup of the dressing until well blended. Place steak in shallow glass dish. Add marinade mixture; turn steak to evenly coat both sides. Cover. Refrigerate 30 min., turning after 15 min. Remove steak from marinade; discard marinade.
GRILL steak 12 min. for medium doneness (160°F), turning occasionally. Cut steak into thin slices.
ARRANGE steak, asparagus and peppers on lettuce-covered plate. Drizzle with remaining 1/4 cup dressing; sprinkle with sesame seed.