Q. What is Reggano sauce?
You asked about Reggano Sauce. Reggano is a trademark brand of Aldi, inc.
Reggiano Sauce is white creamy sauce made from Parmigiano-Reggiano Cheese, much like Alfredo Sauce. (Webster's defines the word Parmesan as 'of or pertaining to the city of Parma in Italy.' Real Parmigiano-Reggiano can only be made in a defined region of northern Italy that includes the counties of Parma and Reggio Emilia in Emilia Romagna.)