Ceviche is a refreshing and tangy Mexican dish made from raw fish or seafood marinated in citrus juices, such as lime or lemon. The acid in the citrus juice cooks the fish, resulting in a flavorful and tender dish. To make ceviche, start by cutting the fish or seafood into small pieces and marinating it in the citrus juice for a few hours. The acid will turn the fish opaque and firm. Add diced onions, tomatoes, cilantro, and jalapenos to the marinated fish for added flavor and texture. Serve the ceviche chilled with tortilla chips or as a topping for tostadas. It is a light and refreshing dish that is perfect for hot summer days.