In-Depth Explanation
Koji is often called 'the national mold of Japan' for its central role in Japanese cuisine. The mold produces powerful enzymes — amylases that break down starches into sugars, and proteases that break down proteins into amino acids (the source of umami). When koji-inoculated rice is combined with soybeans and salt, the result (after months or years of fermentation) is miso. Combined with water and wheat, it becomes soy sauce. Combined with steamed rice and water, it ferments into sake. Western chefs have recently embraced koji for dry-aging steaks, making quick misos, and developing novel umami-rich seasonings.
Explore Related Products & Guides
Related Terms
Fermentation
A metabolic process where microorganisms (bacteria, yeast, or molds) convert sugars into acids, gases, or alcohol. Essential in producing cheese, salami, vinegar, chocolate, sourdough bread, and many other gourmet foods.
Miso
A traditional Japanese seasoning paste made by fermenting soybeans with salt and koji (a fungus). Varieties range from mild white (shiro) miso to robust red (aka) miso. Used in soups, marinades, dressings, and glazes.
Umami
The fifth basic taste, described as savory or meaty. Found naturally in aged cheeses, cured meats, soy sauce, miso, mushrooms, and tomatoes. Umami-rich ingredients enhance and deepen the flavor of dishes.