Ceviche de Conchas Negras is a distinctive Peruvian seafood dish featuring black clams (conchas negras) that are "cooked" in lime juice and seasoned with red onions, chili peppers, and cilantro. The black clams give the dish its characteristic dark appearance and intense oceanic flavor.

This dish originates from Peru's northern coastal region, particularly Tumbes, where black clams are harvested from the mangrove swamps. The preparation method follows the traditional ceviche technique developed by ancient coastal civilizations, who discovered that citrus juice could effectively "cook" seafood.

The preparation is deceptively simple but requires careful attention. Fresh black clams are cleaned and chopped, then marinated in abundant lime juice which chemically "cooks" the meat through a process called denaturation. Red onions are sliced into thin half-moons and mixed with finely chopped chili peppers and cilantro. The mixture is seasoned with salt and sometimes a touch of black pepper, allowing all flavors to meld together.

While the traditional recipe is fairly standard, some variations exist. Some cooks add a touch of ginger for extra zing, while others might include corn or sweet potato on the side, similar to classic fish ceviche. The level of spiciness can be adjusted according to preference by varying the amount and type of chili peppers used.

In Peru, Ceviche de Conchas Negras is typically served as an appetizer or light main course. It's often accompanied by choclo (Peruvian corn), sweet potato, or cancha (toasted corn). The dish is particularly popular in coastal restaurants and is considered a delicacy, especially during summer months when it's most refreshing.

Health-conscious diners should note that while this dish is high in protein and low in calories (approximately 150-200 calories per serving), it's important to ensure the black clams are fresh and properly handled as they're served raw. The dish is naturally gluten-free and dairy-free. However, those with shellfish allergies should avoid it. Some believe black clams have aphrodisiac properties and are rich in iron and zinc, though they should be consumed in moderation due to their high cholesterol content.