What Miso Actually Is
Miso is a fermented paste made from soybeans, salt, and koji. Koji is cooked rice or barley inoculated with Aspergillus oryzae, a mold that produces enzymes which break down proteins and starches into savory, complex flavor compounds. The longer miso ferments and the more salt it contains, the darker and more intense it becomes. White miso ferments for two to eight weeks. Red miso ferments for six months to three years.
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Cook and Mash the Soybeans
Soak 500g of dried soybeans overnight in three times their volume of water.
Cook and Mash the Soybeans
Soak 500g of dried soybeans overnight in three times their volume of water. Drain, cover with fresh water, and cook at a rolling boil for three to four hours until beans crush easily between your fingers with no resistance. Drain and mash thoroughly
Mix the Mash
Weigh your cooked mashed beans.
Mix the Mash
Weigh your cooked mashed beans. Add an equal weight of rice koji and 10 percent of total weight in non-iodized salt. Reserve a small amount of salt to dust the surface later. Mix everything thoroughly by hand until uniform. The mixture should hold
Pack and Press Out the Air
Roll miso into baseball-sized balls and throw each one firmly into your crock
Pack and Press Out the Air
Roll miso into baseball-sized balls and throw each one firmly into your crock or jar to eliminate air pockets. Air promotes unwanted mold growth. Press down firmly with your fist after each addition. Smooth the surface flat and dust with the reserved
Watching and Tending Your Miso Place a weight on top of the plastic to keep pressure on the paste. Store in a cool location between 15 and 25 Celsius away from direct light. Check monthly and remove any surface mold with a clean spoon. Surface mold is common and not dangerous. The paste beneath is fine. Taste at three months to track development and decide when it is ready for your palate.
"Miso does not ask for attention. It just asks to be left alone long enough.
"KaiRenner26th of April 2026