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Jeupjang / jipjang (vegetable jang fermented in horse manure or compost)즙장
Jeupjang is a summer soybean paste with vegetables in it. A special meju of soybeans and wheat or bran is ground, mixed with water, salt and vegetables, sealed in a jar and buried in horse manure or compost, whose heat ripens it in about one to two weeks.
Fully documentedSauces and condiments7 days – 14 days
Recipe
Amounts from a sourceThe 1716 Sallim Gyeongje recipe as quoted in the Encyclopedia of Korean Culture. Mal, doe and hop are old Korean volume measures.
Wheat2 mal
For the meju; soaked, ground and steamed with the soybeans[aks-jipjang]
jeupjang meju (soybean and wheat blocks fermented by moulds)
Total time across the recorded steps: 7 days – 14 days
Start
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What changes:Steamed soybean and wheat dumplings ferment in straw sacks, then dry
Step 1 of 4
Make jeupjang meju and let it ferment
Time
Not documented
Temperature
Not documented
Salt
None given
Acidity
Not documented
In the 1716 recipe, soaked wheat and soybeans are ground, steamed, shaped like knife handles, fermented in straw sacks and dried. A later recipe mixes soybeans with wheat bran in July and layers the meju with pine needles. Output: dried meju dumplings.
Flavour
Not documented
Texture
Not documented
Colour
Not documented
Microbes at work in this step
Not documented for this step.
Method
Measured measured in a studySet fixed by a specification or tested recipeReported one source reports itTypical a general value, not sourced for this fermentUnconfirmed not yet checked against a source
At a glance
Jeupjang is a summer soybean paste with vegetables in it. A special meju of soybeans and wheat or bran is ground, mixed with water, salt and vegetables, sealed in a jar and buried in horse manure or compost, whose heat ripens it in about one to two weeks. Made in 4 steps over 7 days – 14 days. The longest step, bury the jar in horse manure or compost, takes 7–14 days (Yun Deok-in 1995).
Jeupjang uses its own meju of soybeans with wheat or bran, holds vegetables in the paste, and takes its heat from rotting manure or compost, so it is ready in about one to two weeks.
Jangajji typeCucumber and eggplant buried in soybean paste or soy sauce.
Kimchi typeVegetables made into a mash with jeupjang meju.
Jeonju jeupjangMeju of wheat flour and roasted soybean powder kneaded with rice-washing water, mixed with sweet soy sauce, eggplant and cucumber, buried in horse manure for 3 days, and eaten with warm water and honey.
Safety
As a general hazard of meju-based Korean pastes, a 2019 survey of 60 commercial and homemade doenjang samples found at least one mycotoxin in 81.7 % of them, most often fumonisins, ochratoxin A, aflatoxin B1 and zearalenone, and the homemade samples were more contaminated on average. One commercial sample was over Korea's ochratoxin A limit (23.27 against 20 μg/kg), and the authors call the fumonisin levels low. A jar of soybean paste and vegetables sealed and buried in a warm heap is also a warm, airless setting. CDC says botulinum toxin forms in warm, airless food low in acid, salt and sugar, and that home-fermented bean products were linked to 63 % of about 2,000 botulism cases in China from 1958 to 1989. Jeupjang is salted, but the sources give no pH or salt percentage for it, so these old recipes are a historical record, not a tested safe method. The toxin cannot be seen, smelled or tasted.
Hazards the sources name: Mycotoxins (aflatoxins, ochratoxin A, zearalenone, fumonisins), found in a related meju-based Korean soybean paste, doenjang; not measured in jeupjang.
The first record is Hong Man-seon's Sallim Gyeongje of 1716. The Gyuhap Chongseo calls it jeupjang, and its recipe uses wheat bran, soybeans, nuruk powder, water and salt. A Maeil Shinmun article says the word jipjang was first used in a 19th-century household recipe book.
Temperature, salt and pH
The sources we found give no temperature, salt or pH figure for any of its steps.