Working ahead: The fish may be marinated a day in advance; after about 4 hours, when the fish is "cooked," drain it so that it won't become too tangy. For the freshest flavor, add the flavorings to the fish no more than a couple of hours before serving.
There are many ways to serve ceviche. Here are some of our favorites: Place the ceviche in a large bowl and let people spoon it onto individual plates to eat with chips or saltines; spoon the ceviche into small bowls and serve tostadas, chips or saltines alongside; or pile the ceviche onto chips or tostadas and pass around for guests to consume on these edible little plates. Garnish the ceviche with cilantro leaves before serving.
Chile tends to be known for inexpensive reds, but the real secret is the country's terrific Sauvignon Blancs. The cold winds off the Pacific give Sauvignon Blancs like this one a finely-tuned citrus zestiness, perfect for ceviche (something else they do extremely well in Chile).