A popular way to enjoy ceviche in Mexico is on a crispy round fried corn tortilla, called a tostada. You can buy these refreshing ceviche snacks from little streetcart vendors in almost all the cities that lie on the coast. Each coastal city has it's own tostada especial. In Ensenada, for example, the locals place thinly-sliced slivers of avocado, shrimp, and diced octopus on top of the tangy ceviche. Some like to add a splash of worcestershire sauce to top it all off.