I have no idea how 'traditional' these are but here's how I make mine at home. We all think they're yummy. :)
I usually use medium sized white flour tortillas, warmed through and, then we build the tacos with a little fish, cabbage, sauce, mango salsa and a squeeze of lime.
White fish - halibut is my fave, but any kind will do - even lightly breaded frozen filets. If I have fresh fish, I sometimes marinate it in a little lime juice, maybe some chili powder, S&P, then saute it.
finely sliced cabbage (or lettuce)
(diced green onions if desired)
sprinkle with a little white wine or cider vinegar
salt and pepper
Sour cream / adobo sauce
Mix a little adobo sauce into some sour cream or plain greek yogurt. I've also used chipotle spice instead of adobo sauce.
diced mango (fresh or frozen)
diced green onion (and/or sweet white onion)
diced red pepper
sprinkle with lime juice