Place a small saucepan over medium heat.
Add balsamic vinegar and sugar, stir to combine, and dissolve the sugar.
Bring to a light boil, then reduce heat to medium-low. Let the mixture simmer, stirring occasionally, until it thickens and is reduced to about ½ cup. This will take about 10-15 minutes.
The sauce is ready when it's thick enough to coat the back of a spoon. Once chilled, it will thicken more.
Remove from heat and allow to cool completely before serving over salads, fruits, cheese, or meat.
Store in an airtight container in the fridge.
