Rupes in Blackfoot Idaho. It's a little a&w Drive-In type restaurant. They probably have the best shakes I've ever had also. I've also never been disappointed with a burger. They always seem like the ingredients are really fresh.

Every time I go through there I try to stop.

Probably the best meal I've ordered from there;
Blackberry Oreo shake
Reno pastrami Burger
Large tots

If you're ever there, you'll thank me (maybe except your arteries).