Let us it explain. Shake Shack wasn't messing around when they concocted this cheese sauce. It's sharp, creamy, and salty. It brings out the meaty flavors of the beef and complements the salty smokiness of the bacon. Somehow, the sauce isn't overwhelming, and thankfully, it doesn't feel like it's coating your mouth. And yet, it acts as a damn good meat glue, keeping the bacon and beef together for easy eating.
Oh, and did we mention that it's salty?
Although the burger is available as a double for almost $3 extra, all the bacon and cheese on a single is probably enough food to do the job -- especially if you order fries, too. Throw in one of the new Blueberry Pie Oh My shakes or concretes (also for a limited time), and they'll probably have to roll you out of there. That almost happened to us.