Ingredients

2 large russet potatoes (about 1 pound), scrubbed
Four 6-ounce sea bass or cod fillets (about 1 inch thick), skin removed
For the seasoning:
2 tablespoons extra-virgin olive oil
1/2 teaspoon coarse salt
1/2 teaspoon freshly ground pepper
For the coating
1/3 cup low-fat buttermilk
1/3 cup yellow cornmeal
1/4 teaspoon paprika
For the garnish
Lemon wedges
Malt vinegar

Directions

1. Preheat oven to 450 degrees. Arrange racks in upper and lower thirds of oven.
2. Cut potatoes lengthwise into 1/4-inch thick strips. Rinse well in a large bowl of cold water, and pat dry with a kitchen towel. Transfer to a large baking sheet. Drizzle with 1 tablespoon oil, and sprinkle with 1/4 teaspoon each salt and pepper; toss well. Arrange strips in an even layer on the sheet. Bake on lower rack until golden and crisp, about 30 minutes.
3. Meanwhile, place fish fillets in a large bowl. Add buttermilk, and gently turn fish to coat.
4. In another shallow bowl, combine cornmeal, paprika, and remaining 1/4 teaspoon salt and pepper. Add fillets to cornmeal one at a time, turning to completely coat. Transfer to a plate while repeating with remaining fillets.
5. Heat a 12-inch cast-iron skillet over medium-high heat. Add remaining tablespoon of oil; swirl to coat. Add fillets, being careful not to overcrowd pan. Cook until nicely crusted, about 1 minute; turn over with a spatula.
6. Place skillet in top third of oven, and cook until firm but beginning to flake when pressed in the center, about 8 minutes.
7. Transfer to plates, and serve with potatoes. Serve lemon wedges and malt vinegar on the side.

Serves 4.