Cut the filets in strips and season with salt and pepper.
Mix the spices and cover the fish strips with them.
Heat a pan to medium-high heat with vegetable oil. Add the fish strips and sear 2-3 minutes per side. Remember not to overcrowd your pan so they get a chance to blacken.
Remove from the pan and tear carefully with your hands to have smaller sections where you can see the shiny white interior and it makes it easier to eat the taco.