Best burger is not in Michigan, but in Harrison Nebraska, as Sioux Sundry. It's called a Coffee Burger, named after rancher in the vicinity. I believe it was Doris Wasserburger that made the hamburger, link here:
Morning 115 : Harrison, Nebraska : : : roadtrip.beimers.com : : :
But as I recall it was 2 ea 16oz hamburger patties stacked on top each other with lots of cheese, pickles, onion, etc. Saw in a recent obituary that she had died, so that burger may no longer be around. But if you ate very many of them you would be ....round.