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1
To roast the peppers: Heat the oven to 350.
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2
Rub the peppers all over with 1 tablespoon of olive oil, season with 1/2 teaspoon salt, and place them on a parchment-lined baking sheet.
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3
Roast for 30 minutes or so, turning occasionally, until the skins are wrinkled and slightly charred.
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4
Let the peppers cool completely, then peel off the loosened, charred skin.
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5
Slice the peppers lengthwise, discard the stem, and scrape out the seeds.
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6
Cut the halves crosswise in 1/2-inch strips, and let them drain and dry in a sieve.
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7
Pour 1/3 cup olive oil into the skillet, and set it over medium heat.
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8
Stir in the onion and celery, season with 1 teaspoon of the salt and the peperoncino, and cook them for a few minutes to soften.
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9
Stir in the marjoram, sage, and orange zest, and heat until everything is sizzling, then pour in the tomatoes along with a cup of water used to rinse the tomato can and bowl.
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10
Partially cover the pan, heat to a boil, and adjust the heat to keep the sauce perking steadily.
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11
Cook about 20 minutes, until the onion and celery are tender, then remove the pan from the heat.
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12
Pour the sauce into a food mill set over a clean saucepan and pass it through (or mash the sauce with a potato masher and press it through a wire strainer).
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13
Rinse the skillet with a cup of water, and stir into the strained sauce.
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14
You should have about 2 1/2 cups sauce in all.
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15
Stir in the pepper strips, and keep the sauce over low heat while you flour and fry the fish.
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16
Season the fillets with the remaining 1/2 teaspoon salt, and lightly dredge them in the flour, coating both sides and shaking off the excess.
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17
Pour the remaining olive oil into the nonstick skillet, and set over high heat.
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18
Lay the fillets in the pan, flesh side down, and let them cook, without moving, until the first side is nicely browned, about 3 minutes.
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19
Carefully turn the fish, and cook until the skin side is crisp, 2 to 3 minutes more.
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20
Turn off the heat, spoon any excess oil out of the pan, and pour in the pepper sauce so it surrounds the fillets.
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21
Bring to a bubbling simmer, and cook the fish in the sauce just until cooked through, 5 minutes or so, depending on thickness.
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22
Remove the pan from the heat, and lift the fillets with a spatula onto a large warm platter.
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23
Spoon the sauce over the fish, sprinkle the parsley on top, and serve immediately.