Using a small saucepan over medium heat, bring the balsamic vinegar and maple syrup to a boil. Reduce the heat to a low simmer and cook until thickened, for about 10-12 minutes. The glaze should be reduced down to a ½ cup. Set aside to cool.
Recipe by Hip Foodie Mom at https://hipfoodiemom.com/2014/05/25/best-ever-caprese-kabobs-with-balsamic-glaze/