You can make the tomato sauce up to 3 days ahead. Bring back to a simmer before proceeding with the fish.
Salt and freshly ground pepper
Juice of 1 large lemon
1 pound onions, cut in half lengthwise and sliced thinly across the grain
2 large garlic cloves, minced or puréed
1 28-ounce can chopped tomatoes with juice (or 2 pounds grated or peeled/seeded ripe tomatoes)
1/8 teaspoon sugar
1 teaspoon sweet or smoked paprika
1/8 teaspoon cinnamon
1 tablespoon tomato paste dissolved in 1/4 cup water
1/2 cup dry white wine or red wine
Leaves from 1 bunch flat-leaf parsley, chopped (about 1/2 cup)
- Pat the fish dry and season to taste with salt and pepper. Oil one or two baking dishes large enough to accommodate the fish in one layer. Lay the fish in the dish and pour on the lemon juice. Refrigerate for 30 to 60 minutes while you prepare the remaining ingredients.
- Preheat the oven to 325 degrees.
Heat the oil over medium heat in a large, heavy skillet and add the onions. Cook, stirring often, until they have softened and begun to color slightly, 8 to 10 minutes. Add a generous pinch of salt and the garlic and cook, stirring, until the garlic is fragrant, 30 seconds to a minute.
Stir in the tomatoes, sugar, paprika, cinnamon, dissolved tomato paste, wine, half the parsley and more salt and pepper to taste and bring to a simmer.
- Simmer uncovered, stirring often, until the sauce has cooked down a bit and is very fragrant, about 15 minutes. Remove from the heat and pour over the fish. Sprinkle on the remaining parsley.
- Place in the oven and bake until the fish is opaque and pulls apart easily with a fork, about 20 minutes. Baste the fish every 10 minutes if it is not submerged in the sauce. Serve hot or warm, with rice, bulgur, or potatoes.
Nutrition information per serving (based on halibut): 374 calories; 10 grams fat; 2 grams saturated fat; 1 gram polyunsaturated fat; 6 grams monounsaturated fat; 111 milligrams cholesterol; 23 grams carbohydrates; 6 gram dietary fiber; 512 milligrams sodium; 46 grams protein
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