October 2008

Ask Beau - "What is koji - really?"

Posted by admin in 2008, Ask Beau, Newsletter, October

I really liked this question that came from Sarah D. from Vail, CO. who wrote:

"I am confused about the word koji. Is it the mold or is it the molded rice? What is koji really?"

Sarah the lines have been blurred here and many folks make the same mistake. When speaking about the actual mold (Aspergillus Oryzae) you would say the word "koji-kin" - this is the yellow mold that influences flavor and aroma in most sakes and is responsible for breaking the starch molecules into glucose. The steamed rice that gets "sprinkled" with this mold (usually from cans with small holes or mesh) is called "koji" or "koji-mai." So when speaking specifically about "koji" you are talking about the inoculated rice itself.

(On a side note Koji-Kin has a nickname in the brewing industry - "moyashi" which is the Japanese name for bean sprouts. Huh? Yes if you look through a microscope the mold looks like bean sprouts or mushrooms. And without question - if you tour a brewery - nine out of ten times you will see a photo of microscopic "koji-kin" looking very much like a large sprout on the wall somewhere.)

Please send your sake specific questions to askbeau2 @ truesake.com. (This address is not for general questions and I only review the questions once per month. All other correspondence should use info @ truesake.com.)


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