Preheat oven to 400°F.
Cut the lavash in half lengthwise to create two long, thin flatbreads. Place it on a baking sheet and bake for 3-4 minutes to toast.
Chop the tomatoes into fourths, roll and slice the basil into strips, and cut the red onion into thin slices. Set aside.
Assemble by spreading pesto on the toasted flatbreads. Top with shredded mozzarella, red onion, tomatoes, and fresh mozzarella pearls.
Bake for an additional 4-6 minutes or until cheese is melted and edges are crispy.
Remove from oven; garnish with fresh basil and balsamic glaze.
Cut into pieces and enjoy!