Slice the tomatoes into approximately 1/2 inch thick slices.
Put the tomato slices on a baking sheet, season them with the salt and pepper and top with the balsamic vinegar.
Bake for 10-15 minutes until the tomatoes are soft.
Prepare the balsamic reduction by heating the balsamic vinegar and the brown sugar in a small sauce pan over medium heat. Whisk until the brown sugar is dissolved and then heat until the sauce is reduced in half and thickened (approximately 8-10 minutes).
Then slice the mozzarella into approximately 1/2" thick slices and slice the fresh basil leaves.
Carefully place the tomatoes onto a place with a spatula, then layer them with the mozzarella. Top with the basil and drizzle with the balsamic reduction sauce. Enjoy!