This is FANTASTIC! It'a great if you blend it all together like in the recipe, but I personally like layering the prosciutto in first and then putting the butter with the rest of it inside that... the name of the texture of the prosciutto being whole makes a difference for me.
Try it both ways...you can't go wrong with either!
http://bevcooks.com/2011/12/roasted-pork-tenderloin-with-a-fig-prosciutto-and-sage-butter-stuffing/?m