The Big King XL is a Whopper-sized burger with over a half-pound of flame-grilled beef (in the form of two Whopper patties), several slices of American cheese, sliced onions, pickles, lettuce, and special Stacker sauce (also called, "XL Sauce"), on a toasted sesame seed bun.
It's priced at $7.19 at my local Burger King.
The Big King XL was first introduced in early 2019 (you can find my review of it here).
Photo via Burger King.