Miso paste is an excellent fermented food. On the NFI protocol, we use paste made from fermented soybeans to prepare Japanese miso soup. Miso paste is not yet available in supermarkets, but you can commonly find it in health food stores or order it online. There are many manufacturers, and each miso paste will have a slightly different taste. We recommend trying several until you find the one that suits your palate. We purchase Sempio soybean miso paste from the following website: https://www.tasteofasia.sk/p/sempio-sojova-miso-pasta-500-g