For 20 years Sandor Katz has been fascinated by fermentation - the breaking down of food and drink by microbes. Through his books and workshops he has helped thousands of people begin to experiment with flavours, fruits, vegetables, spices... and microorganisms. Dan Saladino travels to Sandor's forest home in rural Tennessee to meet Sandor, hear his story, and discover for himself the transformative potential of this culinary process. Producer: Rich Ward