Sauce Mornay is a white béchamel sauce beaten with butter, grated Parmesan and Swiss cheese. It is thought that sauce Mornay was invented by Duke Philippe De Mornay (1549-1623), Governor of Saumur, Lord of the Plessis Marly in the 1600s. He was a writer on protestant affairs and known as the protestant pope. It is said that he also invented sauce lyonnais, sauce chasseur and sauce porto.
