The Big Mac (introduced in metro Pittsburgh in 1967 and nationwide in 1968) is a hamburger sold by McDonald's, an international fast food restaurant chain. It is one of the company's signature products. It consists of two 1.6 oz (45.4 g) 100 per cent beef patties, American cheese, "special sauce" (a sort of Thousand Island dressing ), iceberg lettuce, pickles, and onions, served in a three-part sesame seed bun.

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