Preheat oven to 450ºF. In a large skillet, heat the EVOO over medium-high heat. Season the chicken (or veal) with salt and pepper, and cook, turning once, for 4-6 minutes. Transfer to a plate.
In the same skillet, bring about 1/4 cup water and the sherry, if using, to a boil, scraping up the browned bits. In a small bowl, pour the liquid over the raisins and let plump for 5 minutes, then drain and chop. In another bowl, combine the raisins, cheese, parsley, pine nuts or almonds, chile pepper, capers, garlic and zest.
Mound the stuffing onto the cutlets and wrap with the prosciutto. Top each with 1 piece of butter. Bake on a baking sheet until the prosciutto is crisp, about 5 minutes. Serve with the lemon wedges.