I agree with Pete,
Prosciutto (IMHO) should not be cooked by direct contact with heat. What Pete mentioned above will be the outcome. If I prepare a saltimboca I pound the ham between to pieces of veal so it warms during cooking, but does not become chewy and dry. Also mentioned above is Saint Daniele prosciutto, it, like Parma ham is very expensive and a beautiful and carefully made product that should be enjoyed how it was intended, cured, sliced thin and eaten with an appropriate accompaniment.Again, only my opinion.