Rice Miso or white miso Shiro Miso, is the result of the natural fermentation of rice and soybeans. With a softer flavor and texture than the rest of the misos, it is ideal for sauces, soups, vegetable dishes or combining it with any of our varieties of Japanese pasta: Udon or Genmai udon. It is one of the misos with a shorter fermentation period, which is why it is also known as "young miso", because it places more emphasis on the saccharization process rather than the fermentation process to achieve that sweet taste. Why is Shiro Miso sweet? The word shiro, in Japanese, means white, a name that was given because the base of fermentation with soy is with white rice. It is also known as sweet white miso.