I'm confused by this as ceviche is typically cooked in the citrus acid rather than cooking/ boiling it. I'm reluctant to cook the shrimp. I've done chopped shrimp (and scallops, et al) in just the citrus juice and it is fine. I'm thinking this is a disclaimer recipe to protect consumers from eating raw shellfish. I'm thinking that soaking the shrimp in the semi-cooled lime water is enough. Pshaw.
This was wonderful. I halved the recipe because there are only two of us, but I wish I'd made the whole thing. I used a fresh jalapeno instead of a serrano because we like spice, but otherwise I made it as-is. This is great with tortilla chips, but we also tried it wrapped in a homemade flour tortilla and it was even better! Very bright and intense flavors.
I would chop the shrimp up in smaller pieces if serving it as a dip. This is a fabulous recipe and very healthy.