Ganjang is Korean soy sauce, but the traditional homemade kind — jip-ganjang, also called joseon-ganjang or guk-ganjang — is not brewed the way Japanese or Chinese soy sauce is. It is the clear, dark brine drawn off a crock of fermenting jang: blocks of dried, mould-ripened soybean (meju) are submerged in salt water for weeks, and when the brew matures the spent meju solids are lifted out to become doenjang while the liquid left behind is strained and boiled down into soy sauce. The result is thinner, paler and far saltier than industrial soy sauce, with a clean fermented depth rather than caramel sweetness. It is the oldest and most foundational of the Korean jang, used above all to salt soups and season namul where its color must not muddy the dish. The same crock yields both the country's two mother condiments at once.
Soy-paste fermentation is ancient in Korea: chroniclers noted that Goguryeo was already skilled at jang-making by the 4th century, and the Samguk Sagi records ganjang, meju and salted seafood among the wedding gifts sent for a Silla royal marriage in 683, which places the meju-brine method firmly in the Three Kingdoms era. Through the Goryeo and Joseon dynasties jang was a household staple, distributed as relief in years of famine and invasion. Joseon cookbooks codified the craft in detail — the early-19th-century home encyclopedia Gyuhap Chongseo lays out not only how to make ganjang and doenjang but the auspicious days for starting a batch, the taboos to observe and how to tend the crock. The split from Japanese-style brewed soy sauce is recent: the short-cut method using koji starter and defatted soybean meal arrived under Japanese occupation, and the traditional crock-drawn kind was renamed joseon-ganjang to mark the difference.
A small taste is startlingly salty and savory, not sweet — saltier on the tongue than a Japanese soy sauce and noticeably thinner, almost watery in body. Behind the salt sits a deep, dark, faintly funky umami from the long meju fermentation, with a clean malty-bean undertone and a long mineral finish. Older, well-aged ganjang turns rounder and darker, the harsh edge mellowing into something almost broth-like. It is meant to be cooked into food rather than used as a dip — a few spoonfuls disappear into a soup and leave only depth.
The magic happens twice. First the meju is made: boiled soybeans are mashed, formed into bricks and dried, then ripened in a warm spot where wild Bacillus subtilis, moulds and yeasts colonize them, loading the blocks with enzymes — proteases, amylases and lipases. Submerged in brine, those enzymes go to work: proteases cleave the soy protein into amino acids, above all glutamate, the source of the savory taste, while the high salt (often a brine strong enough to float an egg) holds spoilage organisms in check and lets salt-tolerant microbes drive a slow fermentation. After weeks to months the solids are removed, and the liquor is boiled down. That final simmer is doing real work: it sterilizes the raw soy sauce for keeping, deactivates lingering enzymes, drives off water to concentrate flavor, and the skimming and heat clarify and darken it.
Variations
The defining axis is tradition versus industry: hand-drawn jip-ganjang (joseon-ganjang) is pale, thin and very salty and is prized for seasoning soups and namul, while modern jin-ganjang — brewed wheat-and-soybean style introduced from Japan, or quick acid-hydrolyzed amino-acid sauce — is darker, sweeter and milder, used for braises, marinades and glazes. Traditional ganjang is itself graded by age: a young first-year sauce versus a deep, syrupy aged one kept and topped up for years, the most treasured being decades old. Cooks often blend the two types, reaching for the salty traditional sort where color must stay light and the rounder brewed sort where sweetness and sheen are wanted.
On the Palate
Where Ganjang sits in the Korean flavor cloud
Ingredients
Serves 40How it's made
8 steps · 2 hours
- 1120 min
Boil dried soybeans until soft, drain, and mash them while warm into a stiff paste.
- 240 min
Pack the mash into firm bricks (meju), surface-dry them, then hang or shelf-ripen in a warm place for several weeks until coated with mould and richly fragrant.
Watch outRipen the meju until it's coated in mould and richly fragrant — that fuzzy surface is the enzyme culture doing its work; a savory-funky smell means it's ready, a sharp rotten reek means it's spoiled.
- 320 min
Rinse and sun the ripened meju to clean off surface mould.
- 415 min
Dissolve coarse salt in water to a brine strong enough to float a fresh egg, and let any grit settle out.
Watch outMix the brine strong enough to float a fresh egg — that salt level is the safety gate that holds spoilage back while the ferment runs.
- 520 min
Place the meju in a clean earthenware crock, pour over the strained brine, and add a few embers of charcoal and dried chilies on top to ward off off-flavors.
- 657600 min
Cover with breathable cloth and ferment in the sun for 40 to 60 days, opening the lid on fine days for airflow.
- 730 min
Lift out the softened meju solids (to be mashed into doenjang) and strain the dark liquid through fine cloth.
- 860 min
Boil the strained liquid down, skimming the foam, until sterilized, clarified and deepened in color, then cool and store in a clean jar to age.
Watch outBoil the strained liquid down, skimming the foam, until it darkens and clarifies — this sterilizes and deepens the color; stop before it over-reduces and turns bitter-salty.
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