Sprinkle top of each fillet with Creole seasoning. Spread 1 teaspoon mustard on each fillet, and top with 1/2 cup of the grated potatoes, packing them down with a spatula; sprinkle each potato crust with 1/4 teaspoon of the salt and 2 turns of the pepper. Heat oil in 2 nonstick skillets over high heat, using 1/4 cup oil per skillet. Using a spatula, gently slide 2 fillets into each skillet, crust side up, taking care to keep crust intact. Fry 2 minutes, then quickly and carefully flip fillets; fry crust side down until golden brown, 2 to 3 minutes.
To serve, pour Red Pepper Sauce onto each warmed plate and top with 1 fillet, crust side up; sprinkle with chopped chives.
Yield: 4 Servings