Japan Times food editor Claire Williamson joins Deep Dive to discuss her new found passion for Aspergillus oryzae, the mold better known in Japan as kōji. Jeremy Umansky and Rich Shih, authors of "Koji Alchemy: Rediscovering the Magic of Mold-based Fermentation," also give us the lowdown on what makes the mold so exciting for them. Hosted by Oscar Boyd
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