Balsamic Vinegar Reduction

Directions

1. 1
   In a small saucepan over medium heat, bring the balsamic to a simmer.
2. 2
   Reduce by 2/3.
3. 3
   Swirl in the butter, one chunk at a time, until fully blended.
4. 4
   The sauce should have a very smooth, velvety consistency and a nice sheen.
5. 5
   Serve immediately.