Free Korean Makgeolli & Nuruk Calculator
Formulate single-stage (*Danhyosik*) or two-stage (*Ihyosik*) brews, Nuruk wheat cake enzyme ratios, raw *wonju* ABV, and drinking dilution yield.
🍶 Rice Mass & Brewing Method
📊 Mash Recipe & Bottling Yield
Recommended Tools & Equipment
Tested hardware and components for high reliability
Traditional Korean Makgeolli: Nuruk & Multiple Parallel Fermentation
Makgeolli (막걸리) is Korea's oldest traditional alcoholic beverage, unfiltered and milky with a sparkling, tangy effervescence. Unlike beer (where malting precedes yeast fermentation), Makgeolli undergoes Multiple Parallel Fermentation (MPF): starch conversion and alcohol creation occur simultaneously in the same jar.
The Microbiology of Nuruk (누룩)
Nuruk is a wild-fermented disc of crushed raw wheat, barley, and rice incubated in warm straw. It harbors a diverse, symbiotic living ecosystem:
- Molds (Aspergillus oryzae & Rhizopus): Secrete amylase enzymes that break down rice starch into fermentable glucose.
- Wild Yeasts (Saccharomyces cerevisiae): Ferment glucose into alcohol and carbon dioxide.
- Lactic Acid Bacteria (Lactobacillus): Produce lactic acid, lowering the mash pH below 4.0 within 48 hours to kill wild contaminants while providing makgeolli's refreshing yogurt-like tang.
Godubap (고두밥) Steaming Technique
Rice must never be boiled into porridge; it is soaked for 2 to 3 hours, drained for 30 minutes, and steam-cooked over boiling water for 45 to 60 minutes until dry, chewy, and translucent (*godubap*). This preserves starch structure so the grains do not dissolve into sludge, keeping the mash aerated.
Frequently Asked Questions
Why should I stir the makgeolli mash twice daily for the first 2-3 days?
Stirring introduces oxygen needed for rapid yeast budding and breaks up the floating cap of rice grains, keeping them moist so fungal enzymes can hydrolyze the starch. After Day 3, stop stirring and seal with an airlock to create an anaerobic environment for alcohol production.
What is the difference between Wonju, Cheongju, and Makgeolli?
When fermentation finishes after 7 to 10 days, the mash separates: 1) Wonju is the raw, unsieved total brew (~15% ABV). 2) Cheongju (Yakju) is the clear, amber liquid scooped from the top. 3) Makgeolli is made by straining the cloudy sediment through a fine mesh brew bag and diluting with water down to 6% ABV.
Can I bottle makgeolli in airtight glass bottles?
BEWARE: Traditional unfiltered makgeolli contains living wild yeasts and residual unfermented sugars. If sealed in airtight glass bottles at room temperature, continuing carbonation will cause violent explosive bottle shatter. Always use plastic soda bottles with headspace, or keep refrigerated below 4°C (39°F).