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1
Make the salsa verde:
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2
Slice the crusts off the bread and discard.
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3
Place the bread on a small plate and drizzle both sides with the red wine vinegar.
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4
Soak the anchovies in a bowl of cold water for 30 minutes.
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5
Remove the bones and reserve the fillets.
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6
In a marble mortar, combine the anchovies, garlic, and capers.
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7
Pound the mixture into a paste.
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8
Add the bread and parsley and pound to a fine paste.
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9
Slowly pour in the olive oil, stirring constantly until all the oil is incorporated.
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10
Add salt to taste, if necessary.
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11
Prepare the halibut:
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12
Preheat the oven to 360 degrees.
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13
Cut 4 sheets of parchment paper into 6 12-inch squares on a work surface.
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14
Place two sprigs of rosemary in the center of each piece of parchment, then place a halibut fillet on top of the rosemary sprigs.
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15
Drizzle with a little olive oil.
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16
Bring the front and back of each piece of parchment together over the centers of each fillet.
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17
Gently fold together 3 times and then fold the ends of the paper under the packets.
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18
Place the packets in a heavy-duty baking pan and bake for 25 minutes.
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19
Remove the fish from the oven and let it rest for 5 minutes before serving.
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20
To serve, unfold the parchment papers and gently slide a spatula under the fillets, lifting each one onto an individual serving plate.
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21
Spoon several tablespoons of salsa verde on top.