The spencerktyleolson’s Podcast

By: spencerktyleolson
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  • New podMiso is a Japanese word that means fermented beans. Miso is usually found in the form of a thick paste, and the beans used during fermentation are almost always soybeans. During the soybean fermentation process, grains like barley, rice, or buckwheat might be added to achieve a certain flavor or other desired attribute, but in most situations, soybeans serve as the basis for miso fermentation. (This basic role of soybeans in preparation of miso can sometimes be overlooked because many varieties of miso may take on the name of their added ingredients, like barley miso or rice miso. Yet virtually all of these miso varieties will contain soybeans as a basic ingredient.)It’s worth noting that under some circumstances, you might hear the word miso being used to refer to fermentation of a food other than soybeans. A good example is fish miso. In this case, the term miso is being used to refer to the process of fermentation rather than the food being fermented. Fish miso is a term used to describe fish that has been fermented using the same basic fermentation process that can be used to produce soy miso, barley miso, or rice miso.This use of the word miso in relationship to fish is important, because it tells us something very special about the miso fermentation process. For many miso eaters, the magic of miso lies in the micro-organism used for its fermentation: Aspergillus oryzae. This micro-organism is a particular type of fungus (a filamentous fungus, also called a mold) that plays a special role in Japanese and other Asian cuisines. Long before scientists had developed ways of identifying and naming fungi like Aspergillus, cultures in China and Japan had developed special methods of fermenting soybeans (and other foods) that were practical and could be reproduced (assuring that the same mold was used, even though this mold was not yet scientifically identified). Koji was the term used to describe the end result when foods were fermented in this special way.When scientists eventually discovered that the Aspergillus fungus was the key micro-organism involved with koji fermentation, the word koji took on a second meaning. While remaining the name for the end-stage product, it also became the name for the Aspergillus fungus itself. Therefore, you can now hear the word koji being used to refer to end-products of Aspergillus fermentation like miso or sake or soy sauce, as well as to the Aspergillus mold itself. You can also hear the word koji being used to refer to a grain-based starter that is used in the production of the above foods (including soy miso). When koji is used to refer to this starter, Aspergillus mold has usually been added to rice that has been pre-soaked and pre-cooked. The result is of this Aspergillus-fermented rice is called koji. For a second stage fermentation into miso, koji starter is then added to soybeans that have also been soaked and cooked, and the entire mixture is allowed to age and ferment into miso. As you can see, the word koji can take on a variety of meanings. But these different meanings tell us something important about miso, namely, the special role played by the Aspergillus fungus in its fermentation.The texture of miso is usually paste-like and relatively thick, along the lines of peanut butter. But the color and taste can vary widely, depending on many fermentation-related factors. In terms of color, the lightest color miso is usually white or beige. This lighter color is often due to inclusion of a large amount of white rice during the fermentation process. When the word koji is used to refer to a miso starter made from rice and Aspergillus, white miso is also sometimes described as containing a large amount of koji. (If the koji has been made from Aspergillus fermentation of roasted rice flour, it may become light brown in color, but is often still included in the category of white miso.) cast weblog
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