Spiral Foods Barley Organic Mugi Miso is a fermented soybean paste made by steaming soybeans and barley and allowing it to sit in cedar vats for at least 2 years. The longer fermentation means this Miso contains more enzymes. During fermentation, the complex proteins, oils and carbohydrates of grains and soybeans are broken down into more readily digestible amino acids, fatty acids and simple sugars. Spiral Foods miso's are naturally fermented in cedar kegs, making them a traditional Japanese food.