The list of fermented food in our lives is staggering: bread, coffee, pickles, beer, cheese, yogurt and soy sauce are all transformed at some point during their production process by microscopic organisms that extend their usefulness and enhance their flavors.
The process of fermenting our food isn't a new one: Evidence indicates that early civilizations were making wine and beer between 7,000 and 8,000 years ago — and bread even before that.
But was exactly is fermentation? And how does it work? Those were the questions that fascinated Sandor Katz for years. Katz calls himself a "fermentation revivalist" and has spent the past decade teaching workshops around the country on the ancient practice of fermenting food.
Katz collects many of his recipes and techniques in a new book, The Art of Fermentation, in which he describes fermentation as "the flavorful space between fresh and rotten."
"If you walk into a gourmet food store and start thinking about the nature of the foods that we elevate on the gourmet pedestal, almost all of them are the products of fermentation," he tellsFresh Air's Terry Gross. "Fermentation creates strong flavors. But they're not always flavors that everybody can agree on."
Take cheese, for instance. Cheese exists in a variety of flavors, including the extra-stinky varieties Katz says he fancies. "But once in a while I'll buy cheese and I've learned that some friends will smell the cheese and walk out of the room," he says. "They'll never think about putting that in their mouths. ... So around the world, you find these iconic foods created by fermentation that create strong, strong flavors that become strong markers of cultural identity and in many cases, people who have not been raised within the culture find these foods very challenging."
In addition to enhancing flavors, fermentation also allows food items to be preserved well past their shelf-life date, says Katz.
"It's not forever like canned foods that you can put into a pantry or storm cellar and forget about for 10 years and still eat it," he says. "These foods are alive, they're dynamic, but they're extremely effective strategies for preserving food through a few seasons, which is really the point."
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