In a medium bowl, whisk together marinade ingredients: vinegar, olive oil, Worcestershire sauce, garlic, pepper, red pepper and salt. Dip flank steak and allow it to absorb the marinade on both sides. Place steak int he center of a baking sheet.(Another option: Transfer to a large ziplock bag if desired and place steak in to allow to coat.)
Toss the broccoli in remaining marinade and place evenly around the steak. ( I also like to sprinkle a little bit of garlic powder on my broccoli but this is not necessary.)
Broil for about 5 minutes, remove the pan and flip the steak. Broil for approximately 5 more minutes or until cooked to your desired level. Remove for the oven and allow to rest for about 5 minutes before cutting. Slice steaks against the grain of the meat and enjoy with your broccoli and rice or desired side dish!
Notes
The rice is optional so not included in nutrition in this recipe.