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1
Preheat the oven to 400 degrees.
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2
For the vegetables, place the butternut squash, potatoes, parsnips, and carrots on a sheet pan and drizzle with 1/3 cup olive oil.
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3
Sprinkle with 1 tablespoon salt and 1 teaspoon pepper and toss together.
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4
Spread out in a single layer and roast for 30 minutes, turning once during cooking.
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5
After 30 minutes, toss with the garlic and roast for another 10 minutes, until all the vegetables are tender and starting to brown.
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6
Meanwhile, line another sheet pan with aluminum foil, and place a baking rack on top of the foil.
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7
Brush the fish fillets on both sides with olive oil and season them liberally with salt and pepper.
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8
Wrap each fillet with a slice of prosciutto to form a wide band around the center of the fillet, overlapping the ends on the skin side.
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9
Arrange the fillets on the rack with the prosciutto seam side down and roast for 10 to 15 minutes, until barely cooked.
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10
While the vegetables and fish are roasting, melt the butter over medium heat in a medium-size saute pan.
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11
Add the rosemary sprigs and cook over low heat until the rosemary leaves are crisp and the butter begins to brown, about 5 minutes.
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12
Discard the rosemary, stir in the lemon juice, and set aside.
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13
To serve, place the fish on a platter or individual plates, spoon the rosemary butter on top, and surround with the vegetables.
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14
Garnish with lemon wedges and serve hot.