Step 1: Prepare the Marinade

In a medium-sized mixing bowl, whisk together the balsamic vinegar, olive oil, Dijon mustard, honey, minced garlic, salt, and black pepper. Ensure that the mixture is well-emulsified to create a balanced, tangy-sweet marinade.

Step 2: Marinate the Steak

Place the flank steak in a shallow dish or a resealable plastic bag. Pour half of the prepared balsamic marinade over the steak, ensuring that it is evenly coated. Massage the marinade into the meat for a few minutes to enhance flavor absorption. Cover the dish (or seal the bag) and refrigerate for at least 2 hours, ideally overnight, to allow the flavors to penetrate the steak fully.

Step 3: Preheat the Grill

Before cooking, remove the marinated steak from the refrigerator and allow it to come to room temperature for about 20-30 minutes. Meanwhile, preheat your grill to medium-high heat (about 400-450°F). If you don’t have a grill, a cast-iron skillet or grill pan can be used as an alternative. Lightly oil the grates to prevent sticking.

Step 4: Grill the Flank Steak

Place the steak on the preheated grill and cook for approximately 3-5 minutes per side, depending on your desired doneness.

• For rare: 120-125°F (about 3 minutes per side)
• For medium-rare: 130-135°F (about 4 minutes per side)
• For medium: 140-145°F (about 5 minutes per side)
• For well-done: 160°F+ (cook longer, but not recommended for flank steak)

Once cooked to your preferred level, transfer the steak to a cutting board and let it rest for 5-10 minutes. This helps the juices redistribute, ensuring a tender and flavorful steak.

Step 5: Grill the Cherry Tomatoes

While the steak is resting, place the cherry tomatoes directly on the grill or in a heated cast-iron skillet. Cook them for 3-5 minutes, occasionally turning them until they become blistered and slightly softened. The slight char enhances their natural sweetness.

Step 6: Assemble the Dish

Thinly slice the rested flank steak against the grain to ensure maximum tenderness. Arrange the slices on a serving platter. Scatter the grilled cherry tomatoes over the steak, followed by the diced fresh mozzarella. Drizzle the remaining balsamic marinade over the top. Garnish with fresh basil for a vibrant finishing touch.

Step 7: Serve and Enjoy

Serve immediately while warm. This dish pairs well with crusty bread, a fresh green salad, or roasted vegetables. Enjoy the perfect balance of smoky, tangy, and creamy flavors in every bite!