In a mixing bowl, combine balsamic vinegar, olive oil, minced garlic, salt, and black pepper. Add the steak and marinate for at least 30 minutes.

Preheat the grill to medium-high heat. Grill the marinated steak for about 5 minutes on each side or until desired doneness.

While the steak is grilling, slice the mozzarella and tomatoes. Arrange them on a plate with fresh basil leaves.

Once the steak is cooked, let it rest for a few minutes. Slice the steak and serve it over the Caprese topping, drizzling with balsamic glaze.