1. Mix paprika, salt, onion powder, garlic powder, cayenne pepper, white pepper, black pepper, dried thyme, and dried oregano together. Set aside.

2. Heat a large cast-iron skillet over very high heat until it is beyond the smoking stage and you see white ash on the skillet bottom, approximately 10-15 minutes.

3. Meanwhile, pour 2 tablespoons melted butter in six small ramekins; set aside and keep warm.

4. Dip each fillet in the remaining melted butter so the both sides are well coated. Sprinkle each side generously and evenly with seasoning mix.

5. Place one or two fillets in skillet and cook uncovered over very high heat until the underside becomes deep brown (almost black) but not burned, about 2 minutes. See note.

6. Turn the fish over and baste with 1 teaspoon of melted butter.

7. Cook until fish is done, about 2 minutes more (see note). Repeat with remaining fillets.

8. Serve while hot with ramekin of butter and lemon wedges.