In a medium sauce pan add balsamic vinaigrette and sugar.

Place over medium heat. Bring glaze to a boil, stirring with a whisk. Reduce heat slightly and simmer, whisking regularly, until it thickens slightly and becomes syrupy, about 15 minutes.

Remove from heat and allow to cool slightly before storing in a tightly sealed container, in the refrigerator, to chill completely before using.