When I went to Wisconsin, I flew into Milwaukee, and on the way back to the airport, we stopped at Kopp's for their famous custard and burgers.
When entering the place, you can't help noticing the all stainless steel kitchen with several custard machines making fresh custard flavors up front.
I started with a cheeseburger with the works and onion rings. The burger was not your usual piled high made to order burger that you can't get your mouth around. It was more like a Whopper- flatter and easier to bite into. It was also pretty greasey.
The onion rings were tasty as well. For my custard, one of the flavors of the day was the butter pecan.