Add the balsamic vinegar and brown sugar to a small sauce pan.
Heat the mixture over medium heat, stirring occasionally.
Bring the mixture to a gentle boil, then reduce the heat to low.
Simmer the mixture for about 15-20 minutes or until it thickens to a syrup-like consistency. Be sure to stir occasionally to prevent it from burning.
Remove from heat and let it cool. The glaze will continue to thicken as it cools.
Once completely cooled, transfer the balsamic glaze to a clean glass jar or airtight container for storage.
Notes
Tips: The balsamic glaze will thicken as it cools. To test the consistency you can take a spoon and put a few drops on a small plate. Place it in the refrigerator. After a couple minutes check the cooled glaze with your finger. If it is sticky and thick it is ready.Storage: Cooled caramelized balsamic vinegar can be stored in the refrigerator for up to 3 weeks in an airtight container.