Combine tomatoes, mozzarella balls, pesto, garlic, olive oil, salt and pepper in a bowl. Toss well to evenly combine all of the flavours.
Arrange prepared avocado halves onto a plate with fresh basil leaves.
Spoon the Caprese filling into each avocado halve and drizzle with balsamic glaze. Top with chopped fresh basil. Serve immediately.
