The Burger & The King is a documentary that suggests that Elvis Presley's true love of his life wasn't actually music--it was food. One can easily find any number of books and documentaries exploring the life of Elvis Presley, but to my knowledge The Burger & The King is the only one that is dedicated to the King's food intake, which is why the film is of course unique and interesting.
It is competently-made, like the majority of BBC made documentaries, and definitely insightful into some of the inner-workings of Elvis' psyche that seem to be rarely touched on elsewhere (don't get the idea that this doc' is really "deep" though, because honestly it isn't... you shouldn't really be expecting it to be either). The documentary even provides recipes for some of Elvis' favorite foods (his favorite sandwich, Fool's Gold, feels like it hardens your arteries just looking at it).
All in all, a unique documentary on Elvis Presley's eating habits and well-worth an hour of practically anyone's time.