The Big Mac consists of two 1.6 oz (45 g) beef patties, 'special sauce' (a variant of Thousand Island dressing), shredded iceberg lettuce, American cheese slices, sliced dill pickles, and minced onions, served in a three-part sesame seed bun. The Big Mac proved popular and it was added to the menu of all U.S. It was designed to compete with Big Boy Restaurants' Big Boy hamburger Eat'n Park was the Pittsburgh area's Big Boy franchisee at the time. The Big Mac debuted at the McDonald's owned by Delligatti in Uniontown, Pennsylvania, on April 22, 1967, selling for US$0.45 (equivalent to $3.66 in 2021). The third name, Big Mac, was created by Esther Glickstein Rose, a 21-year-old advertising secretary who worked at McDonald's corporate headquarters in Oak Brook, Illinois. The Big Mac had two previous names, both of which failed in the marketplace: the Aristocrat and the Blue Ribbon Burger. It was invented in the kitchen of Delligatti's first McDonald's franchise, located on McKnight Road in suburban Ross Township.

The Big Mac was created by Jim Delligatti, an early Ray Kroc franchisee, who was operating several restaurants in the Pittsburgh area. 8 Nutritional values per geographical location.

3.1 The ' Two all-beef patties.' slogan.

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