Ceviche is just denatured fish via citric acid combined with salsa fresca.
When I used to catch fish

, I'd dice up the fish, (in your case, I'd use the

), let it soak overnight in lemon juice. Seperately, make some salsa fresca,
Cilantro
White onion
Tomatoes
Jalepeños
salt n peppa to taste
The next day add the denatured fish to the salsa fresca. Serve with chips, and Pacifico.
You can tweak the basic recipe by adding different peppers, using different citrus, or exotic fruits & veges, but this is simple and good.