Halve or quarter the tomatoes (depending on their size), pick the basil, and tear the mozzarella.
Drizzle with olive oil and set aside.
Combine balsamic and brown sugar in a skillet and whisk to combine.
Bring the mixture up to a simmer over medium heat. Reduce the heat to medium-low, then continue to simmer the mixture, stirring occasionally, until it has reduced in volume by about half. This should take around ten minutes, but the total time can vary depending on your cookware and burner. You'll know it's done when the simmering bubbles linger on the surface of the vinegar instead of immediately popping.
Remove the glaze from the heat and allow it to cool. It will thicken considerably more as it cools. Test the glaze with a spoon, if it leaves a lingering residue that clings to your spoon, it’s done! If it isn't to your desired thickness, you can simmer the glaze again to further reduce.
Drizzle balsamic glaze over caprese salad. Season with a crank or two of salt and pepper and enjoy!
* I used a variety of cherry tomatoes and heirloom slicer tomatoes that I picked up from the farmers market and picked from my garden, but any variety of tomatoes will do.