The Big Mac is the most iconic burger sold at the biggest restaurant in the world McDonald's. The sandwhich was first introduced in 1967 in Pittsburgh, Pennsylvania and later available nationwide in 1968. The Big Mac ingredients are the bun, two hundred percent beef patties, Big Mac sauce, lettuce, American cheese, pickles, and onions. The Big Mac contains 540 calories, 28 grams of fat, and 25 grams of protein. So this sandwich isn't the most healthy in the world ,but it is very good and I highly recommend to get it the next you got to McDonald's.
Source
https://www.mcdonalds.com/us/en-us/product/big-mac.html