This one didn't go over so well with my husband, but my son and I liked it. It is admittedly weird, with dogfish shark and beans layered with tortillas and tomato sauce, but it's a lot tastier than it sounds.
I decided to make it when I went to the tianguis again after going to Campeche where they eat lots of cazon. The fish sellers in the tianguis have told me what kinds of fish they have and I never can remember them all, but cazon finally meant something to me. And it's cheaper than the dorado.