In a small saucepan over medium heat, constantly whisk while simmering the balsamic vinegar and honey together until it reduces to half or the desired thickness.
Let cool before using.
Meanwhile, halve the avocados and remove the seed.
Scoop out a small bit of the flesh if needed, to make them hold the Caprese salad.
Place the avocado on a plate and top with the tomato, mozzarella and fresh basil, followed by a nice drizzle of the balsamic reduction.