1 stick of unsalted butter (buy the best butter you can afford)
Process
Cook the fettuccine and add 2 tablespoons of the pasta water to a large pan. Add the grated cheese and butter and melt down the mixture. Add freshly cracked black pepper and salt. Add the pasta and mix well. Just prior to serving grated more cheese over the pasta, as well as a but more black pepper, if desired.
Recipe by Scordo.com - Italian Food Recipes and Lifestyle at http://www.scordo.com/history/fettuccine-alfredo-fettuccine-al-triplo-burro.html