You can buy Back Forty Beer Vinegar at the Back Forty store.
What Is Beer Vinegar Anyway?
Don’t confuse beer vinegar with malt vinegar. Malt vinegar is made from malted barley that is brewed into ale and then made into vinegar. Beer vinegar can be made with your favorite beer. While malt vinegar is made without hops, beer vinegar can be as hoppy as the beer you start with.
“Beer Vinegar” at Hunter Angler Gardener Cook
“Beer Vinegar: Food as Solace” by Michael Ruhlman
“Let’s Make: Beer Vinegar” at Brooklyn Brainery