Instead of searching your favorite "search" engine, I would go to the chef site's that are known for outstanding Mexican ceviche such as Rick Bayless. Check out this recipe: http://www.rickbayless.com/recipe/shrimp-ceviche-verde/
There are lots of individual recipes, but the basic procedure is to marinate the raw seafood in lime juice. We add cilantro and tomatoes and sometimes mango or pineapple. There are lots of variations on this basic procedure.
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https://food52.com/recipes/search?q=ceviche
Of course, there are many ceviche recipes on the Internet. Use your favorite search engine to help you find those.