Cheddar sauce, cheddar cheese sauce, or cheese sauce is a traditional sauce used in English cooking. The sauce is based upon white sauce, which is known as one of the 'mother sauces', and cheddar cheese. It could be seen as an English equivalent of the French Mornay sauce (itself a variant of Béchamel sauce traditionally mixed with half Gruyère and half Parmesan). The sauce is made by adding an amount of cheddar cheese to white sauce and then spiced using English mustard, Worcestershire sauce and pepper among other ingredients.