If you are looking for something a little different don't pass up chivitos. The chivito is comparbile to the American hamburger, because it "consists primarily of churrasco beef, bacon, mayonnaise, black or green olives, mozzarella and tomatoes, served in a bun with a side of french fries." (Wikipedia) The difference between the two being that the beef used is goat meat.
Lettuce, tomato, thin filet steak, bacon, ham, mushrooms, olives, mozzarella cheese, onion, egg, garlic mayonaise on a non sesame seed bun