1-Start by combining the balsamic vinegar and brown sugar in a small saucepot, stirring until the sugar dissolves fully. Bring the mixture to a simmer over medium heat, then lower it to medium-low and keep stirring often as it reduces by half, usually taking around 10 minutes.

2-Once it's off the heat, let it cool to thicken even more, and adjust as needed by simmering longer if it's too thin or adding a bit of water if it's too thick. For storage, pop any leftovers in the fridge where they'll last up to three weeks.