McDonald’s (NYSE: MCD) has not changed the recipe of the Big Mac since the sandwich first hit menus in 1967.
In recent months, the chain has added a larger version (the Grand Mac) and a smaller one (the Mac Jr.), but aside from the size change, the sandwich has remained the same for nearly 50 years. It’s a recipe so iconic that it has its own song popularized in a 1974 ad campaign — “Two all-beef patties, special sauce, lettuce, cheese, pickles, onions on a sesame seed bun.”