This creation from Boston's Lower Depths Tap Room sounds ingenious:

The prospect of discovering the ultimate bacon cheeseburger is what first piqued my interest: beyond being topped with maple-smoked bacon, the steakhouse’s eight ounces of Angus chuck are actually mixed with bacon grease prior to cooking. The first thing you’ll notice, though, is the strong flavor of fresh garlic that’s also used to season the beef. Next come the combined tastes of mango salsa and habanero aïoli, which balance the garlic and charred beef with a striking mix of sweetness and heat. (Memo to UBurger: the Lower Depths really cooks burgers to order, and my medium-rare request produced a crisp exterior and a juicy, admirably pink heart.)

You had me at infused bacon grease. But what's with the garlic and the mango salsa aïoli? Gilding the lily, says me.

The Lower Depths Tap Room's Steakhouse Burger [Boston Phoenix]