You can't just say ceviche.  It's CEVICHE!  It doesn't get much fresher than this.
Ceviche
From simplyrecipes.com
The recipe says it serve 4-8 but depending how you serve it, i.e. salsa style, it will serve more.
Preparation time:  15 minutes to prepare, 3-4 hours to let 
sit. Always use the freshest fish possible. Make the same day you 
purchase fresh fish.
Ingredients
- 2 lbs of firm, fresh red snapper fillets (or other firm-fleshed fish), cut into 1/2 inch pieces or smaller, completely boned
 - 1/2 cup of fresh squeezed lime juice
 - 1/2 cup of fresh squeezed lemon juice
 - 1/2 red onion, finely diced
 - 1 cup of chopped fresh seeded tomatoes
 - 1 serrano chili, seeded and finely diced
 - 2 teaspoons of salt
 - Dash of ground oregano
 - Dash of Tabasco or a light pinch of cayenne pepper
 
- Cilantro
 - Avocado
 - Tortillas or tortilla chips
 
Method
In a non-reactive casserole dish, either Pyrex or ceramic, 
place the fish, onion, tomatoes, chili, salt, Tabasco, and oregano.  
Cover with lime and lemon juice.  Let sit covered in the refrigerator 
for an hour, then stir, making sure more of the fish gets exposed to the
 acidic lime and lemon juices.  Let sit for several hours in the refrigerator (3-4 hours), giving time 
for the flavors to blend.
During the marinating process the fish will change from pinkish grey and translucent, to whiter in color and opaque.
Serve with chopped cilantro and slices of avocado with heated 
tortillas for ceviche tacos or with tortilla chips.
