In an empty spice jar or small bowl, make the blackening seasoning by combining all of the above dry spices. The mix stores great for as many fish dinners as you can cover. To cook the fish: Heat a heavy skillet (preferably cast iron) on high for a few minutes. Sprinkle St. Peter's Fish Seasoning liberally on both sides of the fish. (I like to sprinkle it on the fish on a plate, flip them seasoning side down in the cast iron, then sprinkle side #2. Less touching of fish that way.) Sear fillets in hot skillet for about 2-3 minutes on each side and flip with a fish spatula. They are cooked through when they flake when you lift a fork in the middle.