Place oven rack 4 inches from broiler; preheat broiler to high. Preheat rimmed baking pan in oven 10 minutes. In large bowl, whisk vinegar and marinade mix. Brush steak with ½ the vinegar mixture.
Remove pan from oven; spray with cooking spray. Place steak on prepared pan; broil 8 minutes. In medium bowl, toss peppers and pineapple with remaining vinegar mixture.
Turn steak; add pepper mixture to pan around steak. Broil 7 minutes or until internal temperature of steak reaches 145° for medium-rare (or to desired doneness). Transfer steak to cutting board; let stand 5 minutes. Slice steak against the grain; serve with pepper mixture.
Serving Size 1
Servings 0
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.