8 tbsp. (1/4 lb. stick) butter, softened
1/4 c. heavy cream
1/2 c. freshly grated imported Parmesan cheese
6 to 8 qts. water
1 tbsp. salt
1 lb. fettuccine (commercial or homemade (page 24)
1 canned white truffle, sliced very thin or finely chopped (optional)
Freshly grated imported Parmesan cheese