How to Cook Boiled Fish with Prahok Sauce
Prepare an authentic countryside Cambodian boiled dish featuring tender fish, fresh native vegetables, and a rich, aromatic fermented prahok broth.
This guide shows how to cook boiled fish with prahok sauce in 35-45 minutes. Start with prep aromatics and vegetables; follow the safety notes and step checkpoints below.
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🧰 Required Tools & Equipment
- ✓ Stockpot or clay pot
- ✓ Fine mesh strainer
- ✓ Mortar and pestle
- ✓ Chef's knife
- ✓ Cutting board
- ✓ Soup ladle
📦 Materials & Supplies
- ✓ Whole cleaned freshwater fish (such as snakehead or tilapia)
- ✓ Prahok (fermented fish paste)
- ✓ Lemongrass stalks
- ✓ Kaffir lime leaves
- ✓ Fresh bird's eye chilies and garlic
- ✓ Assorted vegetables (pea eggplants, morning glory, or green papaya)
- ✓ Palm sugar or white sugar
- ✓ Water
⚠️ Safety Checkpoints & Warnings
- • Use separate cutting boards for raw fish and fresh vegetables to prevent cross-contamination.
- • Steam from boiling prahok broth carries intense aromatics; avoid leaning directly over the open pot.
- • Carefully strain fish paste over hot broth to prevent scalding splashes.
📋 Step-by-Step Guide (6 Steps)
Prep Aromatics and Vegetables
Bruise lemongrass stalks with the flat side of your knife and slice them into finger-length batons. Tear kaffir lime leaves down the center vein and roughly chop your chosen boiling vegetables into bite-sized segments. Lightly crush garlic cloves and chilies in the mortar.
- • Lemongrass stalks are flattened and cut cleanly into 2-inch segments.
- • Vegetables are uniform in size and arranged in separate prep bowls.
- • Leaving kaffir lime stems intact, which can impart excess bitterness.
- • Cutting vegetables too small, causing them to disintegrate during boiling.
Dissolve and Strain the Prahok Base
Bring 4 cups of water to a gentle boil in your pot. Place the prahok paste directly into a fine mesh strainer and submerge the bottom of the strainer into the boiling water, stirring with a spoon to dissolve the paste while catching residual bones.
- • Water turns a cloudy, light-tan color with no whole paste clumps.
- • Coarse bones and scales are trapped inside the mesh strainer basket.
- • Dumping prahok straight into the pot without straining, leaving sharp bone fragments in the broth.
- • Boiling water at maximum heat, which causes splashing during straining.
Infuse Aromatics and Season
Drop bruised lemongrass, torn kaffir lime leaves, and crushed garlic directly into the strained prahok broth. Add a small pinch of sugar to round out the pungent saltiness, then bring the broth to a steady, rolling simmer for 3 to 5 minutes.
- • Broth turns slightly golden-green from lemongrass oils.
- • Steady small bubbles emerge with an intense citrus-umami aroma.
- • Adding excessive sugar early before tasting the natural sweetness of the fish.
- • Letting the broth boil dry from unattended high heat.
Poach the Fish
Gently slide the cleaned whole fish or fish cutlets into the boiling broth. Do not stir or flip the fish vigorously; allow the bubbling liquid to gently cook the flesh through for 6 to 8 minutes until opaque.
- • Fish eyes turn fully white and opaque.
- • Fish meat flakes gently when lightly pressed with the edge of a spoon.
- • Stirring aggressively, which breaks delicate fish flesh into the broth.
- • Overcooking, leading to tough, dry fish meat.
Add Vegetables and Finish
Add hearty vegetables like pea eggplants first, simmering for 2 minutes, then submerge soft leafy greens for the final 60 seconds. Turn off the heat as soon as the greens wilt to a vibrant emerald green.
- • Leafy greens are softened but retain bright green color.
- • Eggplants yield slightly under gentle pressure without turning brown or mushy.
- • Adding all vegetables simultaneously, leaving hard veggies raw or greens overcooked.
- • Leaving heat on after adding tender greens.
Garnish and Serve Countryside Style
Ladle the hot broth, fish, and wilted vegetables into a wide serving bowl. Top with freshly crushed bird's eye chilies and serve immediately alongside steamed jasmine rice.
- • Whole fish is intact in the center surrounded by vibrant greens and clear broth.
- • Bright red chili pieces float visibly on top as a garnish.
- • Letting the soup sit in the cooking pot for too long before serving.
- • Overcrowding the bowl and spilling hot broth.
Credit: inspired by an original tutorial by The Everyday Recipe — watch the original on YouTube.
Don’t have everything?
- No Prahok? Thai fermented fish sauce (pla ra) or salted anchovy paste
- No Clay pot? Standard stainless steel or enameled Dutch oven
- No Palm sugar? Light brown sugar or granulated white sugar