Francis Lam spends a fascinating hour with René Redzepi, the groundbreaking chef of Copenhagen’s Noma. His new book, The Noma Guide to Fermentation, is a master tome on the technique that he believes is the future of the way we cook. Francis and René talk about Noma’s influence on the global palate, where Redzepi finds inspiration, and how he achieves an enjoyable work/life balance. America’s Test Kitchen’s Dan Souza (no slouch in the fermentation world either!) brings us an amazingly simple recipe for cultured butter to make at home. We also have clips from a video interview with René Redzepi and David Zilber, the director of Noma's fermentation lab, in which they two do more in-depth on the role of fermentation at the restaurant and suggest a few projects for beginners.