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1
Position the oven rack in the lower third of the oven and preheat the oven to 400F.
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2
Cut out four 15 x 12-inch pieces of parchment paper.
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3
Fold one piece of parchment paper in half to make a 12 x 7 1/2-inch rectangle, then unfold the paper on a work surface.
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4
Spread 1 teaspoon of the butter in the center of half the paper, covering an area the size of 2 fillets.
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5
Place 2 fillets, side by side and skin side up, atop the buttered area.
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6
Dot the fillets with 1 teaspoon butter.
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7
Sprinkle 1/4 teaspoon of the orange peel and 1/4 teaspoon of the lemon peel over the fillets.
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8
Sprinkle with freshly ground white pepper.
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9
Fold the second half of the paper over the fish.
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10
Beginning at one end of the folded corners, seal the package by folding the edges of the paper at 1-inch increments, overlapping the folds along the edges and tapering the paper inward at the corner to form a crescent-shaped package.
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11
Repeat to form 4 packages total.
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12
To Finish And Serve:
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13
Drizzle the olive oil over a heavy large rimmed baking sheet.
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14
Place the baking sheet in the preheated oven just until the oil begins to smoke, about 5 minutes.
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15
Arrange the packages on the hot baking sheet.
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16
Bake until the packages puff and the fish is just cooked through, about 5 minutes.
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17
Transfer 1 package to each of 4 plates.
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18
Serve immediately, then cut the top of the packages open.
