Balsamic Reduction Syrup: Place 2 cups balsamic vinegar and 1/2 cup brown sugar (light or dark) in a saucepan over medium heat. Stir until sugar is dissolved. Bring mixture to a boil, reduce heat to low and allow to simmer until mixture is reduced by half, about 20 minutes. When reduced, mixture should coat the back of the spoon. Allow to cool completely. Store in an airtight container in the refrigerator.