The Big Mac (introduced in Pennsylvania 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) beef patties, special "Mac"
sauce (a relish variant), iceberg lettuce, Cheddar-blend
Cheese, pickles, and onions, served in a three part
sesame seed bun...