Ingredients

• 1 small onion, quartered and thinly sliced
• 4 tablespoons extra-virgin olive oil
• 2 garlic cloves, chopped
• 1/3 cup dry white wine
• 1 (9-ounce) package frozen artichoke hearts, thawed and drained
• 1 (15-ounce) can stewed tomatoes
• 1/3 cup pitted brine-cured black olives such as Kalamata, chopped
• 2/3 cup water
• 1 1/4 teaspoons salt
• 1/2 teaspoon black pepper
• 4 (6- to 7-ounces) black sea bass fillets (1/2 inch thick) with skin
• 1 tablespoon unsalted butter, cut into bits
• 1 teaspoon finely grated fresh orange zest

Instructions

1. Cook onion in 2 tablespoons oil in a 2-quart heavy saucepan over moderate heat, stirring occasionally, until softened and golden, about 6 minutes. Add garlic and cook, stirring, 1 minute. Add wine and boil 1 minute. Add artichoke hearts, tomatoes (including juice), olives, water, 1/2 teaspoon salt, and 1/4 teaspoon pepper and bring to a simmer, uncovered, stirring occasionally.
2. Meanwhile, pat fish dry and sprinkle with remaining 3/4 teaspoon salt and 1/4 teaspoon pepper.
3. Transfer sauce to a 13- by 9- by 2-inch (3-quart) glass or ceramic baking dish and arrange fish (without crowding) over sauce. Dot fish with butter and cover dish tightly with foil. Roast until fish is just opaque and cooked through, 12 to 14 minutes.
4. Meanwhile, stir together zest and remaining 2 tablespoons oil.
5. Transfer fish with vegetables and broth to shallow bowls and serve drizzled with orange oil.