Light Rice Koji Starter for sweet white Shiro Miso (1 month to age), light yellow Shinshu Miso (6-12 months to age), Amazake, Koji Pickles, and Sake All starters come with detailed instructions and recipes. One starter makes 6 pounds of koji for misos. This is a TWO PART FERMENTATION. Making koji, the first step, mixes cooked grains and/or soybeans with different strains of Aspergillus oryzae, a mold, called "tane koji" or koji starter. This first step involves cooking the grain, adding the starter, and incubating the koji culture about 48 hours. The second fermentation, making amazake, misos, shoyu, or tamari involves simply stirring the koji together with other ingredients according to the directions provided.