Name: Ceviche de conchas negras — Tumbes black cockles
Prep time: 30 min
Cook time: 17 min
Total time: 57 min
Cuisine: Peruvian cuisine
Ingredients: 24 pieces live conchas negras (Anadara tuberculosa) — legal, labelled, traceable harvest; intact shells; about 240 g drained edible meat estimated; 135 ml fresh lime juice — strained; 180 g red onion — finely diced or very thinly sliced; 18 g ají limo — deseeded and finely chopped; 12 g fresh coriander — finely chopped; 3 g fine salt — for dressing; 280 g camote (sweet potato) — peeled and cut into 4 portions; 240 g cooked choclo kernels — well drained, cold

Ceviche de conchas negras — Tumbes black cockles

Yield 4 small starter bowls

Prep 30 minutes

Cook 17 minutes

Passive 10 minutes

Total 57 minutes

Ingredients ↓

Overview

Ceviche de conchas negras — Tumbes black cockles

Ceviche de conchas negras is associated with the mangrove shellfish of Tumbes. The dark natural liquid from freshly opened cockles gives the dressing its distinctive colour, while lime, onion and ají limo sharpen a pronounced marine flavour.

Conchas negras are not interchangeable with ordinary mussels in this dish. They are Anadara tuberculosa, a mangrove-dwelling cockle subject to seasonal harvesting restrictions in Peru. A cook who cannot obtain legal, traceable live specimens should not make a misleading substitute and call it the same preparation.

This is a raw bivalve preparation. Shellfish can harbour bacteria and viruses that neither lime juice nor a brief marinade reliably destroys. Even products from an approved source retain some risk; pregnant people, young children, older adults and immunocompromised people should avoid the raw version.

Ingredients

Cockles and dressing

24 pieces live conchas negras (Anadara tuberculosa) — legal, labelled, traceable harvest; intact shells; about 240 g drained edible meat estimated
135 ml fresh lime juice — strained
180 g red onion — finely diced or very thinly sliced
18 g ají limo — deseeded and finely chopped
12 g fresh coriander — finely chopped
3 g fine salt — for dressing

Sides

280 g camote (sweet potato) — peeled and cut into 4 portions
240 g cooked choclo kernels — well drained, cold

Method

Check the harvest and shellfish.Confirm the 24 live black cockles have a lawful harvest date outside the annual closed season and verified seller traceability. Discard any cracked shell or specimen that stays open when tapped. Hold the shells at 4 °C or colder. Time: 7 minutes. Readiness: All remaining shells are intact and tightly closed or close when tapped. Do not use shellfish without lawful harvest traceability; keep at 4 °C or colder.
Cook the camote.Steam the 280 g sweet potato portions in a covered steamer over boiling water for 17 minutes. Transfer the cooked portions promptly to a shallow heat-safe container. Time: 17 minutes. Readiness: A slender knife enters each piece without force, but the portions still hold together.
Cool the camote.Refrigerate the steamed camote for 10 minutes in its shallow container before serving. Time: 10 minutes passive cooling. Readiness: The camote no longer sends up visible steam.
Open the black cockles.Scrub shell exteriors under cold drinking water. With a protective towel and oyster knife, open each shell over a clean chilled bowl; remove meat and collect its natural liquor. Time: 12 minutes. Readiness: The meat and naturally dark liquid collect in a chilled bowl without grit or shell splinters. Avoid injury while shucking, discard doubtful cockles, and keep raw contents chilled.
Dress the cockles.Combine 135 ml lime juice, red onion, ají limo, coriander and 3 g salt with the cockle meat and reserved liquor. Mix gently just before serving. Time: 4 minutes. Readiness: The dressing turns dark with cockle liquor while onion remains crisp. This remains raw shellfish after lime is added; the acid is not a kill step.
Serve without delay.Distribute the dressed cockles among four small chilled bowls and add the cooled camote and ready-cooked choclo separately. Time: 4 minutes. Readiness: Each bowl includes cockles with some dressing; sides are distinct and not sodden. Keep at 4 °C or colder and serve immediately; do not save raw leftovers.

Practical

Practical guidance

Confirm the current Peruvian closed-season rules before buying: the national restriction on concha negra harvesting runs from 15 February through 31 March each year under the cited rule. Buy only live, lawfully harvested, identified shellfish from a controlled supply chain. A chilled shellfish bowl is not a safe make-ahead meal. Prepare the raw cockles directly before service and discard leftover ceviche. A cooked cockle salad could reduce some infectious risks, but it would be a different preparation, not this raw ceviche.

Control points

Cockles arrive open or crackedThey may be dead or damaged; discard them rather than attempting to disguise the problem with lime.
Dressing contains gritExterior dirt entered during shucking; scrub the shells before opening and keep the shucking surface clean.

Nutrition per serving

Serving size1 of 4 bowls
Calories197 kcal
Carbohydrate36.4 g
Protein12.4 g
Fat1.7 g
Fibre4.5 g
Sodium467 mg

Allergens and food safety

Molluscan shellfish (black cockles). Major cross-contact risk at mixed seafood counters. This recipe contains uncooked shellfish. Lime juice does not reliably kill bacteria, viruses or other hazards; there is no way to guarantee raw bivalves are safe. Only legally harvested, traceable live cockles from an approved seller, kept at 4 °C or colder, should be considered. High-risk individuals (pregnant people, children, older adults and people with weakened immune systems) should not eat raw shellfish. Do not purchase during the annual closed season, from 15 February to 31 March; check current local regulations before purchase.

Closing

Result: A Tumbes-style raw cockle ceviche mixed with lime, chilli, onion and its natural liquor, with strict sourcing and raw-shellfish cautions.
Key control: This is a raw bivalve preparation.