Combine vinegar, sesame oil, and soy sauce in a medium bowl; add cucumber and radishes. Sprinkle with cilantro and salt; toss gently to coat.
Combine hoisin and next 4 ingredients (through red pepper) in a small bowl. Brush half of hoisin mixture over steak. Place steak on a grill rack coated with cooking spray; grill 5 minutes. Turn steak over, and brush with remaining hoisin mixture; grill 5 minutes or until desired degree of doneness. Let stand 5 minutes. Cut steak across the grain into thin slices; serve with vegetables.
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