To make a balsamic reduction drizzle, heat 1 cup of balsamic vinegar in a saucepan over medium heat until it comes to a light boil. Reduce to medium-low and lightly simmer until it's thickened and reduced by about half, stirring occasionally. For a lightly sweetened balsamic reduction, add 1 tbsp sweetener of choice such as brown sugar, maple syrup, agave or coconut sugar.