Steak Salad with Tzatziki

Name: Steak Salad with Tzatziki
Ingredients: 1/4 cup red wine vinegar; 3 tablespoons extra-virgin olive oil, plus more for the grill; 1 teaspoon dried mint; 1 small clove garlic, grated; Kosher salt and freshly ground pepper; 1 small flank steak (about 1 pound); 1 cup bulgur wheat; 1/2 cup nonfat plain Greek yogurt; 2 Persian cucumbers (1 grated, 1 halved and thinly sliced); 4 Campari or other small vine-ripened tomatoes, quartered; 1/2 cup fresh parsley, torn; 1 small head Romaine lettuce, chopped (about 6 cups)