Ceviche is any kind of seafood or fish marinated in lemon juice with or without spices. The marinating time will depend on .....
Ceviche is delicious served over tostadas (fried or oven baked corn tortillas).
I always spread a little refried beans on the tostadas before placing the ceviche on to prevent the tostada from softening. The ceviche is very moist.
I think the shrimp ceviche tostada on the picture looks very appetizing.
Image is under Creative Commons licence. Credit given to “Shreveport-Bossier Convention and Tourist Bureau” from Flickr.com