Filet-O-Fish

“The Filet-O-Fish, also known as the Fish-O-Filet, 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,[1][2] in response to falling hamburger sales on Fridays resulting from the Roman Catholic practice of abstaining from meat on Fridays.[3] While the fish composition of the sandwich has changed through the years to satisfy taste and supply shortcomings, the framework of its ingredients have remained constant; a fried breaded fish fillet, a steamed bun, tartar sauce and pasteurized processed American cheese.” (Wikipedia)