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1
Preheat the oven to 450.
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2
In a small bowl, toss the ham with the mint and parsley.
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3
Open the trout on a work surface, skin side down.
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4
Rub the flesh with olive oil and season with salt and pepper.
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5
Spread the ham mixture on one side of each trout.
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6
Close the trout and press to flatten evenly.
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7
Secure the trout with 8-inch bamboo skewers.
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8
Lightly rub the trout with olive oil and refrigerate them.
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9
In a saucepan, cover the potatoes with water and bring to a boil; boil until tender, about 20 minutes.
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10
Drain and let cool, then peel and cut into 1/2-inch dice.
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11
Meanwhile, put the fava beans in a strainer.
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12
Lower them into the saucepan of boiling potato water and cook until just tender, about 2 minutes.
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13
Transfer the favas to a plate and peel them.
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14
In a medium skillet, heat the 3 tablespoons of olive oil.
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15
Add the garlic, onion and red pepper and cook over moderate heat until softened, about 7 minutes.
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16
Add the hominy, smoked trout, favas and potatoes and cook, stirring, until heated through, about 2 minutes.
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17
Season with salt and pepper.
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18
Transfer the mixture to a 10-inch gratin dish and arrange the mozzarella slices on top.
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19
Sprinkle with the Parmesan.
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20
Lightly drizzle with olive oil and bake in the upper third of the oven for about 10 minutes, or until sizzling and the mozzarella has melted.
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21
Leave the oven on.
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22
Meanwhile, heat 3 tablespoons of the vegetable oil in a large skillet.
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23
Season the trout with salt and pepper.
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24
Add 3 of the trout to the skillet and cook over high heat until browned and crisp, about 4 minutes per side.
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25
Transfer the trout to a baking sheet.
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26
Discard the oil.
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27
Repeat with the remaining 3 tablespoons of vegetable oil and 3 trout.
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28
Bake the trout in the oven for about 4 minutes, or until cooked through.
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29
Preheat the broiler.
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30
Broil the gratin for about 1 minute, or until richly browned on top.
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31
Remove the skewers and transfer the trout to plates.
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32
Serve the gratin alongside.