1 beef Flank Steak (about 1-2 pounds)
Coarse ground black pepper
1/4 cup balsamic vinegar
2 tablespoons olive oil
1 tablespoon basil, chopped
1 1/2 teaspoons Maille, coarse ground mustard
1 clove garlic, minced
1/2 teaspoon brown sugar
Combine marinade ingredients in small bowl. Place beef steak and marinade in plastic food storage bag, turn to coat. Close bag securely and marinate in refrigerator at least 6 hours or overnight, flip bag over, occasionally.
Remove steak from marinade; discard marinade. Broil (or grill) 12-15-20 minutes (med rare-med-med well), turning occasionally.
Sprinkle with coarse black pepper and carve crosswise into thin slices