Prahok
ប្រហុក
Prahok is the fermented fish paste at the bottom of every Khmer dish — here is an honest, home-scale way to make and understand it, timeline and all.
By Cambodian Cookbook Kitchen · May 3, 2026
ទន្លេសាប The Tonlé SapChenla era, c. 550–802
- Prep
- 90 min
- Cook
- 0 min
- Serves
- 12
- Level
- Advanced
Zhou Daguan, the Chinese envoy who spent a year at Angkor in 1296, wrote down what the Khmer ate, and near the top of the list was fermented fish. The Tonlé Sap has fed this cooking for longer than there have been kings to record it: when the Mekong backs up each rainy season and reverses the lake's flow, the water swells to five times its dry-season size and fills with fish, and when it drains, it leaves more fish per person than almost anywhere on earth. Prahok — salted, pressed and fermented in clay — is how a lake that floods once a year gets eaten all year. It is the taste at the bottom of the country.
Making it is less craft than stewardship. Salt, sun and time do the work; your job is to weigh the salt honestly, pack the jar tight, and then leave it alone long enough to become something. The smell will alarm a newcomer and comfort a Khmer — that funk is the sound of a pantry that never fails. A polite stranger, anchovy paste, can stand in for it in a pinch and do a passable imitation of prahok's job. But it is only that: a stranger. The jar in the corner is family.
Prahok is not difficult so much as patient — the only real skill is trusting salt and time, and not opening the jar every week to worry at it.
ពាក្យពីចុងភៅ · A word from the kitchen
Ingredientsគ្រឿងផ្សំ
Serves 12
០ of ៤ gathered
Fish and salt
For the cure
Methodវិធីធ្វើ
Step 1: Clean and bruise the fish
Scale, gut and rinse the fish, then leave them in a colander overnight so the surface dries. Traditionally the fish are trodden or pounded lightly to bruise the flesh and split the skin — this is what lets the salt reach the inside and start the ferment evenly.
Step 2: Salt the first sun-dry
Toss the fish with about a third of the salt and spread them in a single layer to dry in strong sun for a full day, turning once. The surface should go tacky and slightly translucent. This first dry firms the flesh so it holds together through months of curing.
Step 3: Pack the jar
Layer the fish into the jar, scattering the remaining salt between layers and pressing each layer down hard to drive out air. Fish at the bottom of a Khmer prahok jar carry the most weight and cure the deepest — pack tight and leave no gaps.
Step 4: Weight and seal
Lay a plate over the top, set the weight on it so the fish stay under their own brine, and cover loosely. Within a week the salt draws out enough liquid to submerge everything; if it does not, top up with a heavy brine of 300 g salt to a litre of water.
Step 5: Cure and wait
Keep the jar somewhere cool and dark and leave it alone. It is usable at three to four weeks as a young, sharp prahok; it is properly itself at three months, mellow and deep. Good prahok keeps a year or more and only improves.
ឧបករណ៍ · The tools
Equipment
Granite mortar & pestle
ត្បាល់THE Cambodian tool. Kroeung is pounded, never blended — the stone bruises fibre and oil out of lemongrass and galangal in a way a blade only chops. Buy the heaviest one you can lift.
Shop on Amazon →
Equipment links are Amazon affiliate links. As an Amazon Associate we earn from qualifying purchases, at no cost to you. Disclosure.
Questions from the kitchen
Is home-fermented fish safe?
The salt is the safety, which is why the ratio is not negotiable — a quarter of the fish weight in salt, fish kept fully submerged. Trust your nose: prahok smells strong and funky but clean, never sweetish or of ammonia. If in doubt, throw it out and start again.
What if I cannot find trey riel?
Any small, firm freshwater fish will do — the lake's riel are simply what is abundant. Avoid oily sea fish, which ferment differently. A jar made with tilapia or small carp will not be classical, but it will be honest prahok.
Can I just buy it instead?
Of course, and most Khmer cooks do — good prahok is sold by weight in every market. Make it once anyway. Understanding what is happening in that jar changes how you use it in every dish afterward.
បន្ទាប់ · Cook next
