Ceviche

• 500 g
  firm white fish corvina, sea bass, halibut, or snapper — sushi-grade or day-boat fresh
• 180 ml
  fresh lime juice approximately 8 limes — never bottled
• 2 tbsp
  ají amarillo paste the essential Peruvian chilli — fruity, bright heat
• 1 large
  red onion very thinly sliced, rinsed under cold water 5 minutes
• 15 g
  fresh ginger grated, for leche de tigre
• 2 cloves
  garlic for leche de tigre
• large handful
  coriander (cilantro) leaves and tender stems
• 1 stalk
  celery roughly chopped, for leche de tigre
• 50 ml
  fish or prawn stock for leche de tigre
• to taste
  sea salt
• 200 g
  cancha (toasted corn nuts) or cooked choclo kernels — authentic garnish
• 1
  sweet potato boiled, sliced — traditional starch accompaniment

1. 1

   Make the leche de tigre: blend lime juice, ají amarillo, ginger, garlic, celery, half the coriander, and stock until smooth. Strain through a fine sieve. Season aggressively with salt — it will temper when combined with the fish.

   Technique Note ↓
   Technique Depth

   Leche de tigre ('tiger's milk') is more than a marinade — it is the signature element that distinguishes Peruvian ceviche from every other acid-cured fish preparation globally. The blending creates an emulsified, aromatic liquid that penetrates the fish more effectively than straight lime juice. Aggressive pre-seasoning is essential: the fish releases water during curing, diluting the marinade. Season to the point it tastes too sharp and salty alone.
2. 2

   Cut fish into 2cm cubes or bite-sized irregular pieces. Do not slice too thin or it will cure unevenly.

   Technique Note ↓
   Technique Depth

   The cut size controls the cure rate. At 2cm, the acid takes 3–5 minutes to penetrate the centre; smaller pieces cure in under 90 seconds and over-cure before assembly is complete. The cut must be decisive and clean — sawing creates torn edges that cure faster than the interior, leading to a rubbery exterior and raw centre. A sharp knife and a cold fish (nearly frozen) make this easier.
3. 3

   Combine fish and red onion slices in a non-reactive bowl. Pour leche de tigre over — fish should be well covered.

   Technique Note ↓
   Technique Depth

   Non-reactive means glass, ceramic, or high-quality stainless steel — reactive metals (aluminium, copper) react with citric acid to produce metallic off-notes. The onion is rinsed before use to remove the harshest volatile sulphur compounds. The fish must be submerged — any exposed surface will cure unevenly, creating a mixed-texture result.
4. 4

   Let cure 2–3 minutes for soft-textured fish, 5–8 minutes for denser fish. Watch for the colour change from translucent to opaque — this is the cure point. Do not over-marinate.

   Technique Note ↓
   Technique Depth

   The colour change from translucent to opaque is driven by acid denaturing the proteins — the same process as heat cooking, achieved through chemistry rather than temperature. Over-cured fish undergoes excessive protein denaturation: the texture becomes dry, rubbery, and squeaky. The difference between perfect and over-cured is approximately 2 minutes for delicate white fish. Once the fish is opaque throughout, remove from the marinade immediately.
5. 5

   Taste and adjust — the ceviche should be intensely sharp, bright, and hot in equal measure. Add remaining coriander leaves.

   Technique Note ↓
   Technique Depth

   Ceviche is adjusted by taste, not recipe. Lime acidity varies by season and variety; the fish's water content varies by species and freshness; personal tolerance for sourness varies. The correct final balance should trigger immediate salivation — that acute acid response is the sensory signature of great ceviche and the test that separates it from under-seasoned versions.
6. 6

   Serve immediately in chilled bowls alongside cancha corn and boiled sweet potato. The remaining leche de tigre can be served as a shot.

   Technique Note ↓
   Technique Depth

   In Lima, the leftover leche de tigre is considered medicinal — a cure for hangovers and a source of strength, hence 'tiger's milk'. It is often served as a shot alongside the ceviche, or sipped from the bowl after the fish is finished. The three-temperature contrast — cold cured fish, crunchy cancha (room temperature), starchy sweet potato — creates variety that makes the dish more than the sum of its parts.

Chemical denaturation, not heat. Citric acid from lime juice denatures the fish's surface proteins — the same process that heat achieves, but at room temperature and with different textural outcomes. Optimal marination in the Peruvian style: 3–5 minutes. The fish continues to 'cook' in the acid. Beyond 20 minutes, the proteins over-denature and the flesh becomes rubbery.

• 1. Sashimi-grade sea bass (corvina) or the freshest fish available today — this dish has no hiding place for fish that is less than perfect.
• 2. Key limes, not Persian limes — higher acidity and more aromatic volatile compounds.
• 3. Ají amarillo, fresh or paste — the heat and golden colour that is specific to Peru.
• 4. Red onion, sliced hair-thin and briefly rinsed in cold water to remove the raw sharpness.
• 5. Fresh coriander leaves only, not stems — the stems are too assertive.

• The fish surface should be opaque-white but the interior should remain translucent — not fully cooked through.
• The leche de tigre should taste simultaneously of lime, fish, heat, and salt without any one element dominant.
• The onion should have lost its aggression but retained its texture.

• Tahitian poisson cru — coconut milk replaces lime, same acid-free curing principle, same raw-fish ethos.
• Mexican aguachile — extra-spicy, cucumber, minimal curing time; the northern Mexican interpretation.
• Japanese sashimi — no acid curing at all. The raw comparison that illustrates precisely what the acid changes.