McDonald’s back menu that people don’t know well

(1)McDonald’s cheapest basic burger, a burger, consists of bread patty pickle ketchup mustard sauce onions
(2)If you order plain, the back menu, you will get a burger consisting of only bread and patties
(3)But it doesn’t get cheaper
(4)It’s a menu that no one is looking for
(5)Cheeseburger plain with cheese is surprisingly popular in the West