01 -
In a small bowl, whisk olive oil, garlic, Dijon mustard, salt, and pepper together.
02 -
Place the flank steak in a resealable bag, pour the marinade over it, and refrigerate for 1 to 4 hours.
03 -
Heat the grill to medium-high.
04 -
Cook the steak for 5-7 minutes per side, depending on your preferred doneness. Use a meat thermometer for accuracy.
05 -
Allow the steak to rest for 5 minutes, then slice thinly against the grain.
06 -
Combine the halved cherry tomatoes, mozzarella balls, and chopped basil leaves in a small bowl.
07 -
Arrange the steak slices on a serving platter, top with the Caprese mix, and drizzle with balsamic glaze. Serve immediately.