Jering
Archidendron pauciflorum · Fabaceae · also known as Jengkol, Dogfruit, Djenkol bean, Luk niang, Krakos, Blackbead
A Southeast Asian legume seed eaten with real enthusiasm and real caution — dark glossy beans with a garlicky, faintly rank flavour, and a documented ability to crystallise in the urinary tract if eaten to excess.
At a glance
- Taste
- Dense, starchy and strongly savoury, with a garlic-and-sulphur pungency heavier than petai's and a bitter edge. Boiled or fried it turns nutty and creamy; raw it is sharp and astringent.
- Origin
- The Malay Peninsula, Sumatra, Java and Borneo
- Grown in
- Indonesia, Malaysia, Thailand, Myanmar
- Peak season
- Summer, Autumn
- Notable varieties
- Common lowland type
Sensory & practical profile
Taste fingerprint
- Sweetness
- Tartness
- Aroma
- Juiciness
- Firmness
Approximate, at peak ripeness · 0–5
- Ripe when
- The pod has turned dark purple-brown and twisted open, and the seeds inside are full, glossy and heavy. Young pale seeds are milder but more astringent.
- How to eat
- Never eat a large quantity, and drink plenty of water alongside. Peel the papery skin, then boil, braise or deep-fry — soaking or boiling in several changes of water is the traditional step said to reduce the sharpness.
- Typical price
- Budget
Jering is one of very few foods with a syndrome named after it in the medical literature: djenkolism, an acute kidney injury caused by djenkolic acid crystallising in the urinary tract, described in case series across Indonesia, Malaysia and Thailand.
When it's in season, by region
| Region | Peak months |
|---|---|
| Southeast Asia | Mid-year in most of the range, tracking the local rains |
How to select & store
Picking a ripe one
Choose heavy, firm seeds with intact glossy purple-brown skin and no soft or mouldy patches. In Indonesia they are sold both fresh and as pale, fermented, semi-dried beans; the fermented ones should smell strong but clean, not sour.
Storing it
Fresh seeds keep about a week refrigerated in a sealed container, and freeze well. The smell transfers readily, so seal them properly. Semi-dried beans keep for months in a cool dry place.
Practical uses
🍽️ Culinary
- Semur jengkol — Indonesian braise in sweet soy, shallots and spice
- Rendang jengkol and balado jengkol in Sumatran cooking
- Sliced thin and deep-fried into jengkol crisps
- Boiled and eaten with sambal as a side in Malaysia
- Luk niang in southern Thailand, eaten fresh with chilli paste
🌿 Health & traditional
- Used in some Indonesian and Malay traditions for diabetes; this is a statement about traditional usage, not about efficacy, and the plant's real clinical significance is the toxicity described below
🎎 Cultural
- So identified with Indonesian home cooking that the smell is a running national joke
- One of the few foods with a named medical syndrome, djenkolism, in the nephrology literature
Eating jering: what to know
What regular consumption looks like
Jering is mostly water with natural sugars, a little fibre, and assorted micronutrients — a hydrating everyday addition to your overall fruit intake rather than a standout for any one nutrient.
Sensible amounts
A typical fruit serving is roughly a handful, one medium fruit, or about 80 g, and two or more varied fruit servings a day is a sensible everyday pattern.
Evidence & conditions
As a whole fruit, Jering contributes fibre, vitamins, and beneficial plant compounds, but it has not been shown to treat or prevent any specific condition — so it is best enjoyed as part of a healthy diet rather than as a remedy.
Jering: frequently asked questions
What does jering taste like?
Dense, starchy and strongly savoury, with a garlic-and-sulphur pungency heavier than petai's and a bitter edge. Boiled or fried it turns nutty and creamy; raw it is sharp and astringent.
When is jering in season?
Jering is typically in season Southeast Asia (Mid-year in most of the range, tracking the local rains). Peak months shift between the northern and southern hemispheres.
How do you eat jering?
Never eat a large quantity, and drink plenty of water alongside. Peel the papery skin, then boil, braise or deep-fry — soaking or boiling in several changes of water is the traditional step said to reduce the sharpness.
How do you know when jering is ripe?
The pod has turned dark purple-brown and twisted open, and the seeds inside are full, glossy and heavy. Young pale seeds are milder but more astringent.
Is jering good for you?
Jering is mostly water with natural sugars, a little fibre, and assorted micronutrients — a hydrating everyday addition to your overall fruit intake rather than a standout for any one nutrient.
How much jering should you eat?
A typical fruit serving is roughly a handful, one medium fruit, or about 80 g, and two or more varied fruit servings a day is a sensible everyday pattern.
Is jengkol dangerous to eat?
In ordinary culinary amounts it is eaten routinely by millions of people. In excess it can cause djenkolism — an acute kidney injury in which djenkolic acid crystallises in the urinary tract, producing spasmodic flank or lower-abdominal pain, blood in the urine, urinary obstruction and sometimes acute kidney failure. Published case series report that most patients recover with hydration and supportive care, but deaths have occurred. Risk appears to rise with large portions, with eating the beans raw, and with dehydration. This is general information, not medical advice — anyone with severe pain or blood in the urine after eating jengkol should seek urgent medical care.
How do you reduce jering's toxicity and smell?
The traditional preparations do both at once: peel the seeds, soak them — often overnight, sometimes buried in earth or ash — then boil in water that is changed once or twice before the final cooking. Some cooks bury the beans for days to sprout them first. None of this is a guarantee, and the more reliable safeguards are simply eating a modest portion and drinking plenty of water alongside.
What is the difference between jering and petai?
Different plants, and only one carries a medical caution. Jering (Archidendron pauciflorum) has round, dark, glossy seeds and is dense and starchy. Petai (Parkia speciosa) has flat green seeds in a long twisted pod and is pungent but not associated with kidney injury. Both smell strongly and are often sold together, which is exactly why the distinction is worth knowing.
Jering is eaten with genuine devotion across Indonesia and Malaysia, and it is also the only fruit on this site with a syndrome named after it.
What it is
The tree is a lowland legume whose pods twist into dark spirals as they ripen, splitting to reveal round seeds the colour of polished chestnut. Peeled and cooked, they turn dense, creamy and deeply savoury — the basis of semur jengkol, braised slowly in sweet soy and shallots, and of Sumatran rendang jengkol.
The smell is heavier than petai’s and just as persistent.
Djenkolism, plainly
Jering contains djenkolic acid, a sulphur-containing amino acid that is poorly soluble in acidic urine. Eaten in quantity — particularly raw, or by someone dehydrated — it can crystallise in the urinary tract and cause djenkolism: severe spasmodic flank or suprapubic pain, blood in the urine, obstruction, and in some cases acute kidney injury. It is well enough documented to have its own literature, with case series from Indonesia, Malaysia and Thailand.
Most reported patients recover with hydration and supportive treatment. Some have died. The practical rules that fall out of this are unglamorous: eat a normal portion rather than a large one, cook it rather than eating it raw, and drink water with it.
This is general information rather than medical advice; anyone with severe pain or blood in the urine after eating jengkol should get medical help rather than wait it out.
The traditional preparation is a safety step
Peeling, soaking overnight, and boiling in water changed once or twice is not only about the smell. Indonesian cooks also bury the beans in earth or ash for days to sprout them before cooking. Whether these steps meaningfully reduce djenkolic acid is not well quantified — but they are what the cuisine settled on, and they are worth following.
A note on nutrition
We hold no nutrition figures for jering. No national food-composition table we could reach covers it, and we would rather leave the table off than publish an estimate. The entry is therefore excluded from our nutrition rankings.
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