It's pretty easy to make the case that the best burgers are the ones with a great beef flavor. A good burger doesn't need too many frills:

A new burger on the way?

they are cool with cheese, onions or even mushrooms -- but once you start throwing on kimchi or other crazy toppings, you may have gone too far. Now wait until you hear this... A burger with a couple of thick sausage links atop 2 beef patties.

McDonald's China has released a sausage double beef burger, a meat-heavy offering, even for serious meat lovers. This creation features two hamburger patties and then two sausages on top, all sandwiched between a bun. Not really sure how you fit this in your mouth, but hey, you probably don't need a bun for this one.