The Filet-O-Fish was the first item added to the McDonald's menu in the chain's history and it came about due to the Catholic practice during Lent of abstaining from meat on Fridays.
McDonald's franchisee Lou Groen realized in 1962 that his cheeseburger sales were down on Fridays, especially during the time leading up to Easter. Th .
Since becoming a permanent McDonald’s menu item in 1965, the Filet-O-Fish has been made with fried fish, tartar sauce, and — according to McDonald’s — a mere half-slice of cheese. But it wasn’t initially conceived with only a half-slice: When the sandwich was first developed by McDonald’s franchisee Lou Groen, it had no cheese at all.
Since becoming a permanent McDonald’s menu item in 1965, the Filet-O-Fish has been made with fried fish, tartar sauce, and — according to McDonald’s — a mere half-slice of cheese. But it wasn’t initially conceived with only a half-slice: When the sandwich was first developed by McDonald’s franchisee Lou Groen, it had no cheese at all.