If rice is the body of makgeolli, nuruk (누룩) is its soul. Understanding it is the single biggest upgrade you can make as a home brewer.
What it actually is
Nuruk is a cake of grain — usually wheat — that has been colonized by wild molds, yeasts, and bacteria. Those microbes carry the enzymes that turn rice starch into sugar, and the yeast that turns sugar into alcohol. One humble puck does two jobs at once.
Working with it
- Crumble, don’t pulverize. Break nuruk into rough pieces so it disperses without turning to dust.
- Wake it up. Some brewers hydrate nuruk in a little water for an hour before mixing, giving the microbes a head start.
- Trust your nose. Healthy fermentation smells bready, tart, and clean — never rotten.
Storing it
Keep nuruk sealed and cool. In the freezer it will stay lively for many months; just let it come to room temperature before you use it.
Get comfortable with nuruk and every batch after this gets easier. Back to the Learn journal.