Heat balsamic vinegar in a small saucepan over medium heat and bring to a simmer.

Whisk in honey.

Bring to a simmer and turn down to low heat. Simmer, stirring occasionally until mixture has reduced by half and has started to thicken. This will take about 7-10 minutes.

When mixture is done it will stick to the back of a spoon.

Pour into a small glass jar or bowl. Cover and store in refrigerator until you need to use it. It will thicken as it cools.

This stays good for up to one month.