Gochujang
Also known as Korean chilli paste, gochu jang, red pepper paste
PasteFermented
Quick answer
A fermented Korean paste rather than a dry spice mixture, and the fermentation is the point: months of enzymatic and microbial work turn a mixture of chilli, grain and soybean into something sweet, savoury and hot at once. Nothing in a jar of dried spices reproduces it.
In essentially every version: Gochugaru (Korean chilli powder), Glutinous rice, usually as a cooked syrup or powder, Fermented soybean powder (meju garu), Salt, Barley or wheat malt (yeotgireum).
2 distinct versions are set out below. None of them is presented as the correct one, because there isn’t one.
What goes into it
What essentially every version is made from, with what each ingredient is there to do.
| Ingredient | Role | How essential |
|---|---|---|
| Gochugaru (powder)Deseeded, sun-dried and bred for colour rather than heat, which is why gochujang can be built on a very large proportion of chilli and still be only moderately hot. Substituting cayenne or generic chilli powder produces something inedible at the same weight. | base | defining |
| RiceThe starch that the fermentation converts to sugar. This is where gochujang’s sweetness comes from: it is generated during fermentation rather than added, which is why a traditionally made paste tastes different from one sweetened with syrup. | bulking | defining |
| BeansDried fermented soybean block, ground. It supplies the savoury depth and the enzymes and organisms that drive the rest of the fermentation. | savoury depth | defining |
| SaltStructural rather than seasoning. Salt controls which organisms grow during a fermentation that runs for months in an open earthenware pot. | salt | defining |
| MaizeRecorded against the nearest grain SpiceHQ covers. Malted grain supplies the amylase that converts the rice starch to sugar, and it is the reason the sweetness develops rather than being poured in. | binder | usual |
Wide, and along axes that a dry blend does not have. Traditional gochujang varies by the grain used — glutinous rice is standard, but barley, wheat and sweet potato versions all exist regionally — by the length of the fermentation, and by the proportion of chilli, which sets a heat level manufacturers now grade numerically. Commercial paste differs more fundamentally: most of it is made in weeks rather than months using added sweeteners such as corn syrup in place of the sugar a long fermentation generates, which produces a sweeter, shallower paste. Neither is a fake; they are a slow product and a fast one.
The versions
Each attributed, with how firm its proportions are stated plainly.
Traditional, long-fermented
Household traditionHousehold and artisanal Korean practice · proportions representative · low confidence
Glutinous rice, fermented soybean powder, malt, gochugaru and salt, fermented in an earthenware onggi for months and traditionally through a winter. Darker, deeper and less sweet than the commercial product.
| Ingredient | Parts | Share |
|---|---|---|
| Gochugaru | 3 | 27% |
| Glutinous rice | 4 | 36% |
| Fermented soybean powder | 2 | 18% |
| Malted barley | 1 | 9% |
| Salt | 1 | 9% |
Recorded at low confidence. Household proportions vary widely and the fermentation matters more than the ratio; this is a shape rather than a recipe.
Commercial
Typical commercialTypical composition of a supermarket gochujang · proportions reconstructed · low confidence
Faster fermentation with added sweetener. Brighter red, noticeably sweeter and less complex, and what almost everyone outside Korea has actually tasted.
| Ingredient | Parts | Share |
|---|---|---|
| Red pepper powder | 3 | 27% |
| Corn or rice syrup | 4 | 36% |
| Rice or wheat flour | 2 | 18% |
| Fermented soybean powder | 1 | 9% |
| Salt | 1 | 9% |
Reconstructed from ingredient lists rather than published proportions.
Fermentation
What makes it what it is, as studies have found it. Observations, not a method to follow.
Gochujang
Mixed fermentation · Korea · also Korean fermented red pepper paste, fermented hot pepper paste
A grain-based paste with red pepper, made with meju, the fermented soybean block that the biogenic-amine study names as its main protein-rich ingredient.
High-throughput sequencing before and after fermentation found Bacillus, Aerosakkonema and Enterococcus as the main bacterial genera, with Bacillus replacing Aerosakkonema as fermentation went on. Among fungi, Aspergillus dominated before fermentation and the yeasts Zygosaccharomyces and Millerozyma after it. In 35 cottage-industry products, plate counts ranged from 2.79 to 8.73 log CFU/g for aerobic bacteria and 1.56 to 7.15 log CFU/g for yeasts, and five yeast species were identified, Zygosaccharomyces rouxii among them.
Four farm-made pastes were sampled on the day they were made and again after twelve months. After fermentation, salt concentration, pH and reducing sugar had all decreased, while acidity and amino-type nitrogen had increased; salt fell from about 8.2 to 7.3 per cent on average. The pastes differed from one another, and one of the four showed no rise in amino-type nitrogen.
The abundance of Zygosaccharomyces rouxii after fermentation was related by the authors to the flavour of the paste, and a high level of amino-type nitrogen to the abundance of Bacillus before fermentation. The cottage-industry products contained ethanol as their main alcohol, with volatile alcohols, aldehydes, alkanes, nitrogen-containing compounds and terpenes.
Among 35 cottage-industry products, eight carried Bacillus cereus above 4 log CFU/g. Total biogenic amines in the same products ranged from 52.95 to 176.24 mg/kg, with histamine from not detected to 16.94 mg/kg and tyramine from 2.15 to 52.34 mg/kg, all below the toxicity limits the authors cite; they attribute the low levels to the small share of protein-rich ingredients other than meju.
What goes into it
- Fermented: Grain (The papers read call it a grain-based paste without naming the grain in the passages read.)
- Seasoning added: Red pepper
- Salt: Salt (About 8.2 per cent before and 7.3 per cent after a year, on average, in four farm-made pastes.)
- Starter or culture: Meju, the fermented soybean block (Named as the main protein-rich ingredient. It is itself a ferment, and brings organisms with it; the farm pastes studied had no other starter.)
Organisms studies found, and how
- Bacillus and its relatives: Bacillus — reported as dominant, found by sequencing. Four farm-made pastes from four districts of North Gyeongsang, before and after a year: 54.70 per cent of bacterial reads overall, and more after than before. Sources: Physicochemical Characteristics and Microbi… (Results, microbial communities)
- Other bacteria: Aerosakkonema — detected, found by sequencing. The same four pastes: 23.75 per cent of bacterial reads overall, falling after fermentation in all of them. Sources: Physicochemical Characteristics and Microbi… (Results, microbial communities)
- Yeasts: Zygosaccharomyces — reported as dominant, found by sequencing. The same four pastes after fermentation; significantly different before and after. Sources: Physicochemical Characteristics and Microbi… (Abstract; results, microbial communities) Zygosaccharomyces rouxii — detected, grown in culture. One of five yeast species identified among 35 cottage-industry products. Sources: Physicochemical, Microbial, and Volatile Co…
What was measured to change
Each of these was measured before and after, or at several points on the way, in the study named. It is a finding about that study’s material.
Measured to rise during the process
- Amino-type nitrogen. About 1.6 times higher after fermentation, at 182.9 mg per cent, in three of the four; the fourth showed no difference. Compared: The day the paste was made against twelve months later. Several samples: Four farm-made pastes, one from each of four districts of North Gyeongsang, made without a starter culture. Sources: Physicochemical Characteristics and Microbi… (Results, physicochemical characteristics)
Measured to fall during the process
- Reducing sugars. 26.6 to 35.4 per cent before and 17.4 to 31.1 per cent after; in the paste with least, 26.6 before and 17.4 after. Compared: The day the paste was made against twelve months later. Several samples: Four farm-made pastes, one from each of four districts of North Gyeongsang, made without a starter culture. Sources: Physicochemical Characteristics and Microbi… (Results, physicochemical characteristics)
What is not established: Two of the three studies were read in the abstract and conclusions only, and the third in part. The before-and-after comparison is of four farm-made pastes, sampled twice, a year apart. The survey covers small producers in Korea at one time and is not a statement about commercial gochujang. The abstract of the survey says eight products carried Bacillus cereus above the stated level and its conclusions say 22 per cent, which agree.
Using it
Thinned before use, almost always. Gochujang is thick enough to seize in a pan and salty and sweet enough to burn, so it is loosened with water, stock, vinegar or sesame oil before it goes in, and it goes in towards the end of a stir-fry rather than at the start. Its sugars caramelise readily, which is useful on a grill and a nuisance in a hot wok.
Sweet, savoury and hot simultaneously, with a fermented depth underneath that no dry blend reproduces. The sweetness is malty rather than sugary in a long-fermented paste and frankly sugary in a fast one, and that difference is the clearest way to tell them apart by taste.
Moderate, and much lower than a paste this red suggests. Gochugaru is bred for colour, and Korean manufacturers print a numeric heat grade on the tub.
- Bibimbap, as the sauce
- Tteokbokki
- Marinades for pork and chicken
- Stews such as jjigae
- Dressings and dipping sauces, thinned with vinegar and sesame oil
Scaling: Not a blend that is scaled in the ordinary sense — it is bought as a paste rather than mixed from components — but a recipe using it does scale awkwardly, because gochujang carries salt and sugar as well as heat. Doubling the gochujang in a marinade doubles all three, and the salt is usually the first to become a problem.
Gochujang compared
Direct comparisons with the blends and spices it is most often taken for.
Storage
Good for: 12–24 months (typically 18 months)
Refrigerated once opened, with the surface kept smooth and the container closed.
This is the entry where the distinction bites hardest in the whole catalogue. Darkening at the surface is a quality matter and normal. Mould is not: gochujang is a moist high-salt food, and a mouldy tub should be discarded rather than scraped. Every dry spice in this catalogue fails gracefully; this one does not.
Allergens and safety
Not among the substances that must be declared as allergens under EU Regulation 1169/2011 Annex II or under the United States major food allergen rules. That is a statement about labelling law and not about whether allergy occurs: allergic reactions to spices are documented in the clinical literature and are simply not a labelling category. Where a ground spice presents an allergen risk it is usually through adulteration or shared processing equipment rather than through the plant itself.
Culture and origin
Korea, where gochujang is one of the three traditional fermented pastes — with doenjang and ganjang — that underpin the cuisine. Chillies reached the peninsula in the late sixteenth or early seventeenth century, so gochujang as it now exists is younger than that, while the fermented soybean tradition it is built on is very much older.
Korea
Gochujang is one of the three jang — with soybean paste and soy sauce — that a Korean kitchen is built on, and traditionally it was made at home in autumn and fermented through the winter in earthenware onggi kept outdoors. That practice has declined sharply with urbanisation and most households now buy it, which is a real change in living memory rather than an old story.
Sunchang
Sunchang county in North Jeolla has a long-standing reputation for gochujang and a substantial local industry built on it, with the town’s name functioning much as a regional designation does elsewhere.