Grilled Flank Steak with Tomato-Feta Salad

Name: Grilled Flank Steak with Tomato-Feta Salad
Yield: Serves 4
Ingredients: 1 (1½-pound), flank steak, trimmed; 2 teaspoons, sugar, divided; 1½ teaspoons, Greek seasoning; 1 teaspoon, table salt, divided; 1 teaspoon, pepper; 5 tablespoons, extra-virgin olive oil; 1 , shallot, minced; 2 tablespoons, minced fresh mint; 2 tablespoons, red wine vinegar, divided; 1½ pounds mixed, ripe tomatoes, cored and sliced ¼ inch thick; 2 ounces, feta cheese, crumbled (½ cup)