Soju
The world's best-selling spirit by volume — Jinro sells ~900 million bottles a year. Almost all consumed in Korea. Commercial diluted spirit vs traditional pot-still complexity.
Codex Definition
Soju (소주) is a Korean distilled spirit regulated by the MFDS (Ministry of Food and Drug Safety) and the Alcohol Tax Law. The dominant commercial style is diluted soju — neutral grain spirit (typically from tapioca, sweet potato, or rice) diluted with water to 16–25% ABV. This is globally the best-selling spirit by brand volume (Jinro/Hite-Jinro). The traditional style — distilled soju (증류식 소주) — is produced from fermented grain (typically rice with nuruk, the Korean mixed-culture fermentation agent) and distilled in pot stills to approximately 45% ABV.
What soju is — and why Jinro is the world's best-selling spirit
Soju (소주, 燒酒 — "burned/heated alcohol") is a Korean distilled spirit, typically produced from diluted grain neutral spirit (from tapioca, sweet potato, rice, barley, or wheat) to which water is added to reduce strength to the characteristic 16–25% ABV range. This is diluted soju — the dominant commercial style, of which Jinro (진로, Hite-Jinro company) is the global brand, and which is consistently the world's best-selling spirit brand by volume (overtaking all other brands by 2000, a position it has held since). Jinro Chamisul and Jinro Fresh sell approximately 900 million 360ml bottles per year globally — almost entirely within South Korea and the Korean diaspora market.
The more traditional style is distilled soju (증류식 소주, jungnyusin soju) — produced from direct fermentation of grain or sweet potato, then distilled in a pot still without dilution. Distilled soju has a more complex, flavourful character than commercial diluted soju, is produced in smaller quantities, and is significantly more expensive.
The Korean soju classification and the difference from Japanese shochu
Soju and shochu (焼酎, the Japanese equivalent) are closely related spirits with the same Chinese characters (焼酎) and a shared ancestry — the distillation tradition spread from the Middle East through China to Korea and Japan in the 13th–14th centuries, carried along the Mongol Empire's trade routes. The key regulatory and stylistic differences:
| Factor | Soju (South Korea) | Shochu (Japan) |
|---|---|---|
| Governing standard | National Food Standards (MFDS), Alcohol Tax Law | NTA Japan, Liquor Tax Law |
| Commercial dominant style | Diluted soju from neutral spirit — 16–25% ABV | Honkaku (authentic) shochu from direct fermentation — 25% ABV typical |
| Raw materials (commercial) | Primarily tapioca (imported), sweet potato, rice, wheat | Imo-jochu (sweet potato), mugi-jochu (barley), kome-jochu (rice), kokuto-jochu (brown sugar — Amami) |
| Fermentation agent | Commercial yeast; distilled type uses nuruk (누룩, Korean qu-equivalent) | Koji (Aspergillus oryzae or A. kawachii) + yeast — same as sake |
| Distillation | Commercial diluted: column still (neutral spirit) · Traditional: pot or vacuum still | Single distillation (honkaku requirement) in pot still |
| Key region | Nationwide (commercial); Andong (traditional distilled) | Kagoshima (imo-jochu), Oita (mugi-jochu), Kumamoto (kome) |
Nuruk — the Korean fermentation culture and its role in distilled soju
Nuruk (누룩) is the Korean equivalent of qu (Chinese) and koji (Japanese) — a dried cake of fermented wheat or rice flour inoculated with ambient wild moulds and yeasts. Unlike Japanese koji (which uses only Aspergillus oryzae and is produced under controlled conditions), nuruk, like Chinese qu, contains a diverse community of wild organisms: primarily Rhizopus and Mucor species (producing amylase for starch saccharification), plus various wild yeast strains and lactic acid bacteria.
In traditional distilled soju production (and in makgeolli, the Korean unfiltered rice wine from which distilled soju is traditionally derived), nuruk provides both saccharification enzymes and fermentation yeast — a single fermentation agent performing both functions. The diverse wild microbial community in nuruk produces a more complex array of flavour compounds than commercially pure-culture koji, contributing to the distinctive earthy, grainy, slightly funky character of traditional Korean fermented beverages compared to the cleaner, more controlled character of sake.
Commercial diluted soju bypasses the traditional nuruk fermentation entirely — the neutral spirit base is produced in industrial column stills from imported tapioca, then diluted, filtered through activated charcoal, and sweetened with small amounts of sugar or artificial sweeteners to produce the characteristic mild, slightly sweet, clean profile of modern commercial soju.