Fettuccine All'alfredo

"I found this recipe in my "Four Ingredient Cooking" by Joanna Farrow. She states that this is a simple recipe invented by a Roman restaurateur called Alfredo and that he served it with a gold fork and spoon. This recipe says it serves four, but I would imagine alot of people will think it only serves two, so up this recipe as you see fit to serve your families appetites. This is not a garlic flavored recipe but one for the original recipe, so might want to serve with very seasoned tasty main dish/meat. Or you might want to add some minced 1/2 tsp. minced garlic to the butter in the beginning before adding the cream...."