Tahiti's iconic national dish — sashimi-grade tuna briefly marinated in fresh lime then bathed in cold coconut milk with crisp vegetables.
Poisson Cru Tahitien (poisson cru meaning 'raw fish' in French) is widely considered the national dish of French Polynesia, eaten daily in Tahiti and across the Society, Tuamotu, and Marquesas archipelagos. It belongs to the same tradition as Peruvian ceviche, Hawaiian poke, and Wallisian fafaru — the ancient human discovery that citrus acid denatures fish proteins, transforming texture and perceived palatability without heat. But Poisson Cru Tahitien has a defining element that distinguishes it from every other cured-fish preparation in the Pacific: the addition of full-fat coconut milk after draining the lime marinade. This step transforms what would be a sharp, acidic ceviche into something richer and creamier, the coconut tempering the lime and enveloping the tuna in a gentle, slightly sweet dressing that carries the flavour of the islands in every bite. The dish is deceptively simple, and its simplicity is exactly why the quality of ingredients matters so acutely. The tuna must be genuinely sashimi-grade — bought the same day, with firm, deep red flesh and absolutely no fishy smell. Any deviation in fish quality is immediately apparent because there is no cooking process to hide it. The marination window is equally critical: ten minutes in lime juice is the professional standard in Papeete's markets and restaurants. At ten minutes the outer layer of fish turns opaque and the texture firms pleasingly while the interior remains silky. At fifteen minutes the exterior becomes slightly chewy. At twenty-five or more it approaches the texture of cooked fish and the flavour sharpens unpleasantly. The coconut milk must be full-fat, cold, and poured over at the very last moment — it should barely mingle with the residual lime rather than fully integrate. The finished dish should be served in a chilled bowl within five minutes.
Serves 4
Place four serving bowls in the freezer for 10 minutes before assembly. Cold bowls are not optional decoration — they keep the coconut milk from warming and separating when it hits the bowl, preserving the clean, white appearance of the finished dish. Refrigerate the can of coconut milk if not already cold.
Sashimi-grade tuna should be kept refrigerated until the very last second before cutting. The colder the fish, the cleaner and easier to dice precisely.
Using a sharp, thin-bladed knife, cut the tuna into neat 2 cm cubes. Even, consistent sizing matters here — it ensures every piece marinates at the same rate and the finished dish has a pleasing visual uniformity. Place the diced tuna in a non-reactive bowl (glass or ceramic — not metal, which can react with the lime acid).
Pour the lime juice over the tuna and sprinkle with the sea salt. Toss gently with a spoon to coat every piece. Set a timer for exactly 10 minutes and refrigerate immediately. Do not go beyond 10–12 minutes or the exterior of the fish will overcure and become rubbery. You will see the surface of the tuna turn from deep red-pink to a lighter, opaque pink — this is the citric acid denaturing the proteins.
Use freshly squeezed lime juice only, never bottled lime juice. The citric acid content in bottled juice is standardised and different from fresh, producing a less nuanced result.
After exactly 10 minutes, drain about 70–80% of the lime juice from the tuna, retaining approximately 2 tablespoons in the bowl. The residual lime is important — it provides acidity that balances the coconut milk. Completely draining produces a flat result; too much lime left in makes the coconut milk curdle slightly.
Add the diced cucumber, tomato, and spring onion to the drained tuna. Toss gently with a spoon — you are not trying to mix vigorously, just to distribute the vegetables through the fish without breaking the tuna cubes.
Pour the cold coconut milk over the tuna and vegetable mixture. Stir once or twice very gently — you want the coconut milk to coat the fish rather than be fully incorporated into a uniform sauce. Add a pinch of white pepper and taste; adjust salt if needed. Immediately spoon into the chilled bowls and serve — this dish should reach the table within 3 minutes of adding the coconut milk.
Fish quality is the only variable that truly matters. Buy sashimi-grade yellowfin (ahi) tuna from a fishmonger who can confirm it was line-caught and delivered that day. The flesh should be deep crimson or brick red, very firm, and smell of nothing but clean ocean.
The 10-minute marination window is a professional standard, not a suggestion. Set a kitchen timer. At 10 minutes the tuna is perfect — the outside cured, the inside silky. At 20 minutes it has crossed into overcured and the coconut milk cannot save the texture.
Refrigerate the coconut milk can for at least 1 hour before using. Cold coconut milk poured over the tuna stays white and clean-looking; warm coconut milk separates slightly and looks greasy.
Remove the seeds from the tomato before dicing — tomato seeds add excess water that dilutes the coconut dressing. Cut the tomato in half through the equator and squeeze gently over the sink to expel seeds before dicing.
This dish does not benefit from additional seasoning beyond salt, white pepper, and the residual lime. Do not add garlic, ginger, chilli sauce, or any other flavour element — the purity of tuna, lime, and coconut is what defines authentic Poisson Cru Tahitien.
Add thinly sliced bird's eye chilli and a tablespoon of thinly sliced fresh mint for a version closer to what you find in contemporary Papeete restaurants.
Salmon version: substitute sashimi-grade Atlantic or king salmon for the tuna — its higher fat content makes it especially luscious with coconut milk, though the colour will shift from deep red to pale pink.
Avocado and mango addition: fold in half a diced ripe avocado and a quarter of a diced mango just before serving for a more elaborate, tropical-fruit-forward version served at special occasions throughout the Society Islands.
Scallop version: use 500 g of sashimi-grade diver scallops, sliced horizontally in half, in place of tuna. Marination time drops to 5 minutes — scallops cure more quickly and their texture becomes rubbery fast.
Poisson Cru Tahitien must be served immediately after the coconut milk is added. The fish cannot be stored once dressed — the citric acid continues to act, the vegetables release water into the dressing, and the tuna's texture deteriorates rapidly. Marinated-and-drained tuna (before adding vegetables and coconut milk) can be held in the refrigerator for up to 2 hours if needed.
Raw fish marinated in citrus is a technique shared across Polynesia, Melanesia, and Latin America — the parallel development of ceviche, poisson cru, and kokoda reflects the universal discovery that acid can 'cook' protein. The Tahitian version's defining coconut milk addition is documented in French ethnographic accounts from at least the early 20th century, though the practice is certainly older. Today Poisson Cru Tahitien is the first dish offered to any visitor to French Polynesia and appears on every menu from roadside roulottes (food trucks) in Papeete to fine dining restaurants in Bora Bora's overwater bungalow resorts.
Yes, when made with genuinely sashimi-grade tuna purchased the same day from a reputable fishmonger. The lime juice denatures the proteins on the outer surface of the fish (which is what makes it turn opaque) but does not kill parasites the way heat does. Freezing fish to -20°C for 7 days before serving does eliminate parasite risk — your fishmonger can advise whether their tuna has been handled this way.
Exactly 10 minutes in the refrigerator. This is the professional standard used in Tahiti's market stalls and restaurants. At 10 minutes the exterior is perfectly cured while the interior stays silky and sashimi-like. Beyond 12 minutes the tuna becomes progressively more rubbery, and at 20 minutes the texture has overcured to the point where it resembles tinned tuna.
The marinated-and-drained tuna (after the lime marinade is mostly drained but before vegetables and coconut milk are added) can be prepared up to 2 hours ahead and held covered in the refrigerator. Dice the vegetables ahead and keep them separate. Add vegetables and cold coconut milk immediately before serving — never more than 5 minutes before plating.
Yellowfin tuna (also called ahi or albacore in some markets) is the traditional choice in Tahiti and produces the best colour and flavour. Bigeye tuna is an excellent alternative. Avoid bluefin (prohibitively expensive and ecologically stressed) and canned tuna entirely.
Either the coconut milk was warm when added (always use a chilled can), or the bowl was warm, or there was too much residual lime juice in the fish when the coconut milk was poured in. Excessive acid causes coconut milk proteins to coagulate. Drain the lime marinade more thoroughly (leave only about 2 tablespoons) and ensure your coconut milk is cold straight from the refrigerator.
Per serving · 4 servings total
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