 It is dark, nearly black, with a distinct look and flavor.It is prepared with lime juice, onion, yerba buena, salt, pepper, tomato, Worcestershire sauce, and sometimes picante (any kind of hot sauce or any kind of hot pepper) as desired.In Nicaragua and Costa Rica, the dish includes marinated fish, lime juice, salt, ground black pepper, finely minced onions, coriander (cilantro) and finely minced peppers.