Ceviches are prepared with raw fish, seafood, or both. They are marinated in lime juice with red onions and a blend of spices. Traditional ceviche is served with sweet potato, Peruvian corn, and canchita. Ceviche carretillero is served with pieces of Peruvian corn, and canchita. * Consumer Advisory: Ceviche is a traditional Peruvian item that is served raw or undercooked. Consuming raw or undercooked foods may increase your risk of contracting a food borne illnes.