2 cups aged balsamic vinegar
3/4 cup fresh or frozen blackberries
Bring vinegar and berries to a boil, reduce to medium low and simmer for 5 minutes. Let cool. Strain into small bowl, using the back of a serving spoon to push all the berry goodness and vinegar out of the fruit pulp. The vinegar should reduce a little, giving it more of a syrupy consistency.
Cover and chill until ready to use. Put it on everything. Will keep for at least a month in the fridge.