Poisson Cru (Tahitian Raw Fish Salad)

Method

1. Marinate the tuna. Place cubed tuna in a glass bowl. Pour lime juice over the fish — it should be mostly submerged. Refrigerate for 15–30 minutes. The exterior will turn opaque.

   Marinating is about flavor penetration, not just surface coating. Acid-based marinades (citrus, vinegar) work faster but can over-tenderize if left too long. Oil-based marinades are gentler and more forgiving.

2. Drain most of the lime juice. Leave about 2 tablespoons in the bowl.

   Drain thoroughly — excess water dilutes sauces and prevents browning. A few extra seconds of draining makes a noticeable difference in the final dish.

3. Add coconut milk and grated ginger. Stir gently to combine.

   Stir only when necessary. Constant stirring prevents browning and can break down ingredients that benefit from sustained heat contact.

4. Add the vegetables. Fold in cucumber, tomato, red onion, and carrot.

   Fold gently to preserve the air you've incorporated. Use a large spatula, cut through the center, and sweep along the bottom and up the side. Overmixing deflates the mixture.

5. Season with salt. Taste and adjust — the lime and coconut should be balanced. Add more lime for brightness or more coconut for richness.

   Season generously — underseasoned food is the most common home cooking mistake. You can always add more at the end, but building seasoning in layers produces deeper flavor than a single pass.

6. Serve immediately in bowls, garnished with cilantro. Eat with a spoon.

Equipment

• Glass or ceramic bowl (not metal — acid reacts with metal)
• Sharp knife Recommended: Victorinox Fibrox Pro 8-Inch Chef's Knife · Also good: Victorinox Fibrox Pro 8-Inch Chef's Knife
• Citrus juicer

Chef Notes

• The most important thing: Use sushi-grade fish. Poisson cru is raw fish "cooked" by citrus acid — the lime juice denatures the proteins on the surface but doesn't kill parasites the way heat does. Sushi-grade fish has been flash-frozen to eliminate parasites. Don't use regular fish counter tuna.
• Marinate the tuna in lime juice for 15–30 minutes. The acid turns the exterior opaque and firm while the center stays raw and silky. Over 30 minutes and the fish becomes tough and chalky — the acid over-denatures the proteins.
• Add the coconut milk after the lime marination, not during. The fat in coconut milk slows the acid's effect on the fish. Lime first, then coconut.
• This is Tahiti's national dish — the Pacific Island version of ceviche. The coconut milk makes it richer and more tropical than South American ceviche.
• Serve immediately after adding coconut milk. The dish doesn't hold well — the fish continues to "cook" in the acid.

Common Substitutions

Ingredient	Substitution	Notes
Tuna	Sushi-grade salmon or mahi-mahi	Different flavor, same technique
Coconut milk	Coconut cream	Richer, thicker
Lime juice	Lemon juice	Less tropical
Cucumber	Jicama	Crunchier
Red onion	Shallot	Milder

What You're Practicing

Poisson cru teaches you acid "cooking" — using citrus juice to denature fish proteins without heat. This is the same technique behind ceviche, aguachile, and kinilaw. Understanding how acid affects protein gives you a whole category of no-cook preparations. Visit Brines, Cures & Marinades for more on acid marination.

You're also learning Pacific Island flavor building — combining raw fish, coconut, and citrus into a balanced, refreshing dish. This flavor profile is the foundation of Polynesian, Melanesian, and Micronesian cooking. Explore more at Techniques.