"Koji is a culture prepared by growing... '... mold on cooked grains and/or soybeans in a warm, humid place. Koji serves as a source of enzymes that break down (or hydrolyze / digest / split) natural plant constituents into simpler compounds when making , , , , and other fermented foods. Its fragrant white... mycelium... has a delightful aroma resembling that of mushrooms. ...Koji is written with the exact same character in China and Japan. ...In China this character is romanized as qu... Koji was invented in China at least three centuries before the Christian era."