Diced fish, lemon, onion, salt and chili- to taste. Everything else is just a nice complement.
These are Ceviche's, a typical Peruvian dish, basic ingredients, that can vary according to the region.
There are many good restaurants to try Ceviche in Peru, we should recall that last year in April "Chez Wong", restaurant that belongs to Peruvian cook Javier Wong, was awarded and considered Ceviche ...