In Coeur d'Alene ID is Hudson's Hamburgers. They offer
Hamburgers
Cheeseburgers
and some Hamburger with egg thing, iirc.
Pickles and onions are the additional items i believe.
At the counter (no tables) they have ketchup and some wicked good hot mustard.
They have a soda fountain with Green River on tap, but no fries.
The grill-master has a bag of significantly non-lean burger in a stainless tub. When you place your order he grabs a handful of beef, forms the patty and tosses it on the grill. Is it the best burger I have ever eaten, probably not, but it is one of my favorite place to stop when I'm over that way.
Best hamburger I ever had was with blue-cheese and served on a toasted english muffin. Mmmm