- Heat grill to medium high (about 425 degrees). Have coals centered and close to the grate. Place a 10-inch cast iron pan directly over the coals and let it get hot about 4−5 minutes.
- Season the fish with salt and pepper. Add fat into the pan and place fish in the pan. Close the lid and let them cook on one side for about 5−8 minutes, depending on thickness. When the fish is somewhat firm to the touch, it is done. Flip the fillets and immediately remove from the heat. Let fish rest a few minutes in the pan and serve.