In a shallow dish, combine the olive oil, balsamic vinegar, salt, and pepper. Add the flank steak and turn to coat. Cover and refrigerate for at least 1 hour.
Preheat the grill to medium-high heat.
Remove the steak from the marinade and discard the marinade. Grill the steak for about 5 minutes per side or until desired doneness.
Let the steak rest for 10 minutes before slicing against the grain into thin strips.
In a large bowl, combine the mozzarella cheese, tomatoes, basil, and extra-virgin olive oil. Add the steak strips and toss to combine.
Serve the salad at room temperature.
Interesting Facts
Caprese Salad originated in the beautiful Italian island of Capri.
This salad is traditionally served with balsamic vinegar, but can be served with any type of vinaigrette.
Flank steak is a lean and flavorful cut of beef that is perfect for grilling.