I love ceviche too. One of my Aunties makes it kinda like a pico di gallo with tomatoes and stuff. I've seen it made with avocado, grapefruit, mango...all kinds of stuff.
I prefer oysters raw too but there are some oysters that don't taste good shucked. Maybe if you load up on the tabasco or horseradish but they taste really, I dunno....just gross. They're not rotten or old, they just don't taste as good as like maybe an Olympia Oyster. Maybe it's just that...
From the looks of the recipe, it might be that there is not enough cornstarch added to first mixture to thicken the filling properly. I'd use another recipe...:ohmy: