I am such a wing-it in the kitchen, I am thinking something thick but not Mayo, Sour Cream perhaps cut a bit w/ milk or cream, lime juice, maybe a bit of mustard. Also I'd add a steak rub,, that I get from a High End grocer near my home that is their own blend that would make a flip flip delicious, it would come out like a South-West sauce. If you want heat, add the Sirachca.
Another way to go would be guacamole w/ the spices, lime and Salsa verde. The Salsa verde is my twist on Guac, it's probably been done before but it makes it amazing. You could put that on the shell or wrap before the other ingredients as it will hold it all in place and you get the good fat of the Avocado.
Yummy.
make a seafood salad, stuff an avocado with that, squeeze of lime...
This thread is cracking me up. If you don’t like catfish, you could use cod. It is so delicious, that people fight over them at my house.
https://www.food.com/recipe/fried-catfish-tacos-with-chipotle-cole-slaw-emeril-lagasse-207656