Line roasting pan with slices of bacon and place rolled veal on the bacon. Spread meat with softened butter and surround it with chopped onion, carrots and celery. Season meat generously with salt and freshly ground black pepper, and roast it in a preheated hot
Remove strings from roast, and brush top and sides with egg; sprinkle with breadcrumbs and Parmesan, and return to the oven for 15 minutes, or until crumbs are golden.
Reduce pan juices over high heat; strain and serve with roast.