Fake a Fancy Vinegar

"You could spend a fortune on aged balsamic vinegar, but you
can get the same effect by reducing (cooking down) regular balsamic
vinegar, (make sure it is gluten-free.) Just simmer in a saucepan and
the vinegar will thicken into an intense sweet-tart glaze. Try drizzling
it on grilled chicken or steak."

-Food Network Magazine October 2010