In the beginning, the self-described "fermentation fetishist" Sandor Katz loved sour pickles.
"For whatever reason, I was drawn to that flavor as a child," he tells Fresh Air's Terry Gross. "And then when I was in my 20s, I did quite a bit of dietary experimentation and ... I started noticing that whenever I ate sauerkraut or pickles, even the smell of it would make my salivary glands start secreting."
After Katz moved from New York City to a rural community in Tennessee, his fascination with all things fermented increased.