Step 1- Mix the monkfish with all of the spices and lime juice, let sit for just about 3 to 5 minutes, be careful to not wait too long, your lime juice will cook the fish a little if you wait too long.
Step 2- Heat the butter in a non-stick pan, so it's foaming.
Step 3- In batches add your monkfish filets, brown each side, cook for about 3 to 5 minutes a side. Test to see if one's cooked, should be white all the way through and slightly fluffy, you don't want it to be chewy.
Step 4-Once the fish is cooked, use a fresh lime and squeeze some juice on it for good measure.
Step 5- Plate your tacos with your tortillas and enjoy!