01 - In a shallow bowl, whisk together buttermilk and hot sauce. Add catfish fillets, turning to coat evenly. Refrigerate for at least 15 minutes.
02 - In a separate bowl, combine cornmeal, all-purpose flour, Cajun seasoning, paprika, garlic powder, salt, and black pepper. Mix thoroughly to ensure even seasoning distribution.
03 - In a large skillet or deep fryer, heat 1 inch of vegetable oil to 350 degrees Fahrenheit.
04 - Remove catfish from marinade, allowing excess liquid to drain. Dredge each fillet in the cornmeal mixture, pressing gently to ensure coating adheres properly.
05 - Fry fillets in batches for 3 to 4 minutes per side until golden brown and cooked through. Drain on a wire rack or paper towels.
06 - Combine mayonnaise, dill pickles, capers, lemon juice, Dijon mustard, and fresh parsley in a bowl. Mix well and season with salt and pepper to taste.
07 - Plate the fried catfish while hot and serve with tartar sauce on the side.