Ceviche de lenguado is a traditional Peruan ceviche variety made with flounder as the star ingredient. Although there are many variations and recipes, other ingredients used for this ceviche usually include lime juice, thinly sliced onions, olive oil, garlic, salt, white pepper, and hot peppers such as serrano or jalapeño.

The fish fillets are cut into strips that are marinated in a mixture of garlic, salt, white pepper, and lime juice. The fish is placed in the fridge for an hour and it's then mixed with hot peppers, onions, and olive oil. Everything is mixed well and left to rest for a few minutes before serving.