Cook pasta according to package directions. Add peas to pasta during last 2 minutes of cooking. Drain and rinse with cold water; drain well.
While pasta cooks, combine mayonnaise and next 6 ingredients (through garlic) in a large bowl. Add pasta mixture and arugula; toss to coat.
Heat oil in a skillet over medium-high heat. Add prosciutto; sauté 2 minutes. Drain on paper towels. Sprinkle prosciutto over salad.
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