The Filet-O-Fish is a fish sandwich sold by the international fast food restaurant chain McDonald's. It was created in 1962 by Lou Groen, a McDonald's franchise owner in Cincinnati, Ohio, in response to falling hamburger sales on Fridays resulting from the Western Christian practice of abstaining from meat on Fridays, which plays an important role in Roman Catholicism, Methodism and Anglicanism. While the fish composition of the sandwich has changed through the years to satisfy taste and address supply shortcomings, the framework of its ingredients have remained constant; a fried breaded fish fillet, a steamed bun, tartar sauce and pasteurized American cheese.