Catfish Fillet Sandwiches with Red "Firecracker" Sauce

Description
A Catfish recipe.

Catfish

 * 4 x 4- to 5- ounce U.S. farm-raised catfish fillets, frozen
 * 1 teaspoon dried oregano
 * salt and freshly ground black pepper
 * 4 teaspoons olive oil

Red Firecracker Sauce

 * 2 tablespoons lime or lemon juice
 * 2 teaspoons Dijon mustard
 * 1½ teaspoons chili powder
 * 1 teaspoon ground cumin
 * ¼ teaspoon cayenne pepper
 * ⅛ teaspoon garlic powder
 * ¼ cup olive oil
 * salt and freshly ground black pepper

Serving

 * 4 soft sandwich rolls
 * lettuce leaves, alfalfa sprouts, or coleslaw
 * 8 slices ripe avocado
 * salt and freshly ground black pepper
 * 4 thin slices red onion
 * 4 teaspoons sour cream or plain yogurt

Directions

 * 1) Preheat the oven to 425°F.
 * 2) To prepare the catfish, place the frozen catfish fillets in a baking pan large enough to hold them in a single layer.
 * 3) Sprinkle with oregano and season with salt and pepper.
 * 4) Drizzle the fillets with olive oil.
 * 5) Bake about 12 minutes or until flakes easily when tested with a fork.
 * 6) Cool.
 * 7) Cover and refrigerate while preparing the sauce.
 * 8) The catfish can be prepared up to 1 day in advance and refrigerated.
 * 9) To prepare the red firecracker sauce, place lime or lemon juice and mustard in a non-corrosive medium bowl.
 * 10) Using a wire whisk, mix until smooth.
 * 11) Whisk in chili powder, cumin, cayenne pepper and garlic powder.
 * 12) Gradually whisk in olive oil until it forms a smooth, slightly thickened sauce.
 * 13) Season with salt and pepper to taste.
 * 14) Cover and set aside.
 * 15) The sauce can be prepared up to 3 days in advance (if the sauce separates, whisk until blended)
 * 16) Cut the cooked fillets in half and coat each piece with some of the sauce.
 * 17) Spread a little of the sauce on the bottom of each roll and cover them with lettuce leaves or sprouts or coleslaw.
 * 18) Place two pieces of the dressed fillets on top of the greens on each roll.
 * 19) Place avocado slices on top and season with salt and pepper.
 * 20) Place red onion slices on top of the avocado and add a small dollop of sour cream or yogurt.
 * 21) Top with other half of the roll.
 * 22) Cut sandwiches in half and serve.