You probably don't think of mold in a good way. But koji is a special, very small fungus that creates culinary wonders in Japanese cuisine. Koji, or Aspergillus oryzae, has been known to man for more than two thousand years...
Natto is a popular fermented soybean food in Japan since ancient times and one of those things, who haven't got real popular over here due to the strange flavour...
Surely you have already tried Soba, right? Translated, it means buckwheat and this so-called pseudo grain is used to make delicious noodles that are also very digestible.