The Marinade Variations in the flavor of seviche depend upon the particular citrus juice or combination of juices and the other ingredients used in the marinade.
Panamanian businesses serve seviche with buttered saltine crackers or in dainty pastry shells.
It is also served in a large crystal bowl with the guests helping themselves, either by spearing it with toothpicks or filling the pastry shells. In Mexico, seviche is accompanied by slices of raw onions and served on toasted tortillas. Here is a version of seviche which Japanese housewives were making hundreds of years ago. They call it sashimi and serve it with horseradish or very strong mustard. Mix the other ingredients and pour over the fillets which have beend placed in a glass bowl or platter.