Prepare tartar sauce by stirring together all the sauce ingredients, set aside to let the flavors mingle while you prepare the fish.
Preheat the oven to 300ºF.
Dry fish well on paper towels and season with salt and pepper.
Sprinkle one side (only one side!) with the glucomann powder. Then dip the glucomann covered side in egg and finally, dip it in the pork panko, pressing to ensure that a thick layer sticks.
Heat a cast iron skillet over medium high heat. Add avocado oil, and when shimmering, add the coated fish, pork panko side down and cook until golden, about 5 minutes. Flip the fish over and transfer the whole pan into the oven and cook for another 5 minutes, or until the fish flakes easily. Serve fish with tartar sauce.