What can you do with a vat of cider vinegar?

My husband, the homebrewer, decided to make hard cider a couple years ago. It fermented into a nice alcoholic beverage that we never got to taste because by the time we opened the carboy (fermenting vessel), it had turned to vinegar. Now I have about six gallons of wonderful, expensive apple cider vinegar.

Rather than throw it out, we’d like to make use of it. However, we don’t usually go through a ton of cider vinegar in this house. Do you know any new and exciting ways to use this bounty? There’s only so much vinaigrette dressing you can make (especially when he can’t eat lettuce), and it’s too good to use as white vinegar in household cleaning.

All suggestions are welcome. And if you live nearby and want a bottle of cider vinegar, I’m your gal. :)