Preheat oven to 425°.
Place crust on a baking sheet. Spread sauce over crust; sprinkle with fontina. Toss turkey with vinegar. Top pizza with turkey, onion, Parmigiano-Reggiano cheese, and pepper.
Bake at 425° for 12 minutes or until crust is browned. Remove from oven. Sprinkle with arugula and prosciutto.