Miso goes in last, off the heat
Miso is soybeans fermented with koji mold and salt. Fermentation builds savory, fruity, nutty aromas, and unpasteurized miso holds live microbes too. A rolling boil drives off the aromas and kills the cultures. The soup tastes flat.
Thin the miso before adding it
Miso is a thick paste, and a whole spoonful dropped in won't spread. Whisk it smooth with a ladle of hot, not boiling, broth in a small bowl. Then stir that into the pot with the heat off. No lumps, no salty pockets.
Test yourself
Questions from the interactive lesson, with the answer and the why.
Why do recipes add miso at the end, off the heat?
Boiling drives off aroma and kills live cultures. Fermentation aromas are volatile, and heat also kills live microbes.
True or false: Miso stirred into soup off the heat keeps more aroma than miso boiled in the pot.
True. Volatile aroma compounds escape fastest at a rolling boil, so gentle heat keeps more of them.
What went wrong? You drop a spoonful of miso into the soup and keep it bubbling for ten more minutes. The soup smells flat and tastes only salty.
Miso went in too early and boiled. Long boiling drives off the aroma of miso, so add it off the heat.
Fill the blank: Miso is soybeans fermented with salt and a mold called ___.
Miso is soybeans fermented with salt and a mold called koji. Koji mold breaks soy proteins down into savory compounds.
You're seasoning a miso soup. When should you add extra salt?
Only after tasting once the miso is stirred in. Miso is salty, and you can only judge the total after it dissolves.
