* hot cooked pasta, such as fresh egg noodles, fettucini, tagliarini, or hot or cold tortellini, ravioli or gnocchi.
Melt butter with cream, tomatoes, and the 1/2 teaspoon nutmeg in a wide frying pan. Stir in the cooked pasta and bring quickly to boiling; stir gently from time to time. Let boil rapidly 1 to 2 minutes, then blend a little of the hot sauce with the egg yolk. Remove pan from heat and stir in egg yolk mixture and the 3/4 cup Parmesan cheese, blending thoroughly. Serve at once, offering additional nutmeg and Parmesan cheese.