Saute bacon in Dutch oven: when almost crisp, add prosciutto, brown sligtly. Remove bacon and ham to drain on paper towel. Saute onion in bacon drippings until soft; return bacon and ham to the pan Stir in sherry; simmer 2 minutes and remove from the heat. Add butter and let melt in pan. Cook spaghetti(or linguine) according to package directions. Drain well. Add hot spaghetti to Dutch oven; return to heat and toss. Remove from the heat; add eggs beaten with salt and pepper; toss quickly for a minute or two. Sprinkle with Freshly Grated Parmesan Cheese. Using freshly grated cheese instead of the already grated stuff makes a difference. Serve Immediately.