In a bowl, mix balsamic vinegar, olive oil, garlic, dried basil, salt, and pepper. Add the steak and marinate for at least 30 minutes.

Preheat the grill to medium-high heat. Remove the steak from the marinade and grill for about 5-7 minutes on each side or until desired doneness.

While the steak is grilling, slice the mozzarella and tomatoes, and chop the fresh basil.

Once the steak is done, let it rest for a few minutes. Slice the steak and top with mozzarella, tomatoes, and basil before serving.