McDonald's Big Mac is a classic hamburger that has been around since 1967. It consists of two all-beef patties, special sauce, lettuce, cheese, pickles, and onions, all on a sesame seed bun. It's a tasty and convenient meal
From Wikipedia
The Big Mac is a brand of hamburger sold by the international fast food restaurant chain McDonald's. It was introduced by a Greater Pittsburgh area franchisee in 1967 and expanded nationwide in 1968, and is regarded as McDonald's flagship product.