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1.With a sharp knife, remove the skin and white pith from oranges. Working over a bowl, cut the segments from their surrounding membranes. Squeeze juice into the bowl before discarding the membranes. Transfer the orange segments to another bowl with a slotted spoon and set aside.
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2.Crush peppercorns with a mortar and pestle or place in a small sealable bag and crush with a small heavy skillet, the smooth side of a meat mallet or a rolling pin.
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3.Pour 1/4 cup of the orange juice from the bowl into a blender. Add 1/4 teaspoon of the crushed pepper, 1 cup parsley, 3 tablespoons walnuts, 2 tablespoons oil, vinegar, 2 teaspoons capers, mustard, honey, garlic and salt; puree until smooth.
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4.Combine Treviso (or radicchio), romaine, arugula and the remaining 1 cup parsley in a large bowl. Toss with 1/2 cup of the dressing.
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5.Heat the remaining 1 tablespoon oil in a large nonstick skillet over medium-high heat. Sprinkle shrimp with the remaining crushed pepper. Add the shrimp to the hot skillet and cook until bright pink and browned, 1 to 3 minutes per side.
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6.Transfer the salad to a platter or 4 dinner plates. Top with the reserved orange segments, the shrimp and the remaining 4 teaspoons capers and 1 tablespoon walnuts. Serve drizzled with the remaining dressing.
