Whisk together balsamic vinegar and honey in a smallsaucepan. Bring to a simmer over medium heat then reduce heat to low and letsimmer until thickened and reduced down to nearly 2 tbsp, about 8 - 11 minutes.
Put into small bowl and let cool to room temperature, about 10 minutes.
Layer tomato slices, fresh mozzarella slices and basil on a rimmed serving platter.
Drizzle with olive oil, balsamic reduction and season with salt and pepper to taste. Serve immediately.