While there are plenty of fish in the sea, and some of them make damn fine tacos, the best way to top a tortilla is with fresh, seasoned grouper. It’s meaty but not fishy and takes flavors well. Here’s a very simple way to bring that grouper goodness to your table. You’ll need some kind of sauce, too, but we leave that to your discretion. Our favorite (as shown above) is pico de gallo. That’s just diced tomatoes and onions kicked up with some lime juice and chopped cilantro (or, if you can find it, culantro, which has a less soapy flavor). A good add for the fish and the pico is some Chile Límon seasoning, which you should be able to find in your local Mexican tienda. While you’re there grab some Mexican table cream (crema), which is not sour cream, but a smooth dairy product that doesn’t challenge the flavor of the food.