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Ceviche de Conchas Negras, served with fresh seafood and avocado
Exotic black clam ceviche in dark lime marinade

Black shell ceviche

Author: Flavelo
Recipes Starters
This ceviche is the 'black sheep' of seafood – in the best sense of the word. 'Conchas negras' (black cockles or blood clams) are famous for their dark juice and intense, iron-rich, oceanic taste. This is not a simple starter dish, but a true gourmet adventure. The dark juice of the clam mixes with lime and vegetables, creating a dramatically looking, deep-flavoured dish revered in Latin America as an aphrodisiac.
🕒 Prep Time 30 mins
⌛ Total Time 30 mins
🍽️ Servings 4 servings
🔥 Calories 280 kcal
🌍 Cuisine Mexican

Ingredients

Equipment Needed

  • Oyster knife
  • Strong brush (for cleaning shells)
  • Glass bowl
  • Chopping board

Allergen Information

⚠️ Molluscs

Instructions

1 ✓

Scrub the shells thoroughly under running water. Open them with a sharp knife, collect their dark juice in a bowl, and scrape out the meat.

Tip: The shell juice gives the dish its soul and characteristic colour, do not pour it away!
2 ✓

Cut the clam meat into bite-sized pieces and put back into its own juice. Pour over the lime juice and let stand in a cool place for 10-15 minutes.

Tip: The acid 'pre-cooks' the clam here too, but careful not to leave too long or it becomes rubbery.
3 ✓

Meanwhile cut the red onion into very thin semi-circles, dice the tomato, chop the chilli and garlic finely.

Tip: Thinly sliced onion adds texture without overpowering the clam taste.
4 ✓

Mix the vegetables (onion, tomato, chilli, garlic) and coriander into the marinated clams. Season with salt and pepper.

Tip: Taste! Clams can be salty naturally, so be careful with salting.
5 ✓

Immediately before serving, dice the avocado and gently fold in, or pile on top so it doesn't break.

Tip: Avocado fat softens the sharpness of lemon and chilli.
6 ✓

Serve cold, with the juice, with crispy corn chips or salt crackers.

Recipe FAQ

Where can I get black cockles?
This is a speciality ingredient, look for it in seafood delis or larger fish markets. If unavailable, cockles can substitute, though the flavour experience will differ.
Is it safe raw?
Only use live cockles bought from a reliable source. Discard any that are open and don't close when tapped!

Ingredients

  • 500 g Fresh black cockles/clams (in shell)
  • 5 whole Limes (freshly squeezed juice)
  • 1 head Red onion
  • 2 tbsp Fresh coriander (chopped)
  • 1 whole Jalapeño chilli
  • 2 cloves Garlic
  • 0.5 tsp Salt
  • 0.5 tsp Freshly ground pepper
  • 2 whole Tomatoes
  • 1 whole Ripe avocado