Combine the white vinegar, olive oil, lime juice, garlic and spices together in a bowl. Mix well. Pour the marinade over the steak and turn to coat. Marinate in the fridge for at least 1 hour up to 24 hours.

After it's finished marinating, place the steak a baking sheet, turn the oven to broil and set the rack to the top position. Broil the steak for 6 minutes, flip, broil 5 more minutes for medium. Cook longer for more well done steak, but keep in mind that flank steak will get tough the more you cook it.

Let rest 10 minutes. Cut the steak into slices and serve with Tomatillo Avocado Salsa, fresh cilantro and lime wedges.