Sandwiching meaty black sea bass fillets together with an aromatic filling of red onion and fresh oregano perfumes the fish as it roasts.
IngredientsFor salad:
1 garlic clove
1/2 teaspoon anchovy paste
2 tablespoons red-wine vinegar
1/4 cup extra-virgin olive oil
1/2 pound grape tomatoes (preferably mixed colors), halved if large
1/2 pound cherry tomatoes (preferably mixed colors), quartered if large
12 Kalamata olives, pitted and coarsely chopped
4 sun-dried tomatoes packed in oil, chopped
1 1/2 tablespoons chopped oregano For fish:
4 (6-to 8-ounce) black sea bass fillets with skin, any pin bones removed
2 tablespoons extra-virgin olive oil, divided
1/2 medium red onion, thinly sliced
6 (3-to 4-inch) oregano sprigs Equipment: kitchen string Preparation Make salad:
Mince and mash garlic to a paste with 1/2 teaspoon salt. Transfer to a bowl and whisk in anchovy paste, vinegar, and 1/4 teaspoon pepper. Whisk in oil. Toss with remaining salad ingredients. Let stand, stirring occasionally, while fish roasts. Roast fish:
Preheat oven to 425�F with rack in middle. Oil a 1 1/2-to 2-quart gratin or other shallow baking dish.
Rub flesh sides of fish with 2 teaspoons oil (total) and season with 3/4 teaspoon salt and 1/4 teaspoon pepper (total). Divide onion slices and oregano sprigs into 2 portions and sandwich each portion between 2 fillets, skin sides out. Tie with kitchen string crosswise at 2-inch intervals and transfer to baking dish. Score skin on top in several places with a sharp knife and drizzle with remaining 4 teaspoons oil.
Roast fish until just cooked through, about 15 minutes. Cut off string and cut sandwiched fillets in half crosswise. Serve topped with salad.
Cooks' note:Salad can be made 6 hours ahead and kept at room temperature.