1. Melt butter or margarine in a sauce pan over medium heat. 2. Add heavy cream, stirring constantly. 3. Stir in salt, grated Parmesan cheese, and grated Romano cheese. 4. Stir constantly until melted, then mix in egg yolk. 5. Simmer over medium low heat for 3 to 5 minutes. 6. Garnish with additional grated Parmesan cheese, if desired. ---------------------------------------------------------------------------
Nutrition
Ingredients