Recently a friend's mom came to town and took us out to dinner. She said she remembers a Chicago restaurant from many years ago (before I lived in Chicago) that only served mashed potatoes (of many varieties). She listed some five or six of the "dozens" of different mashed potato menu items she remembers.
Now, I'm pretty certain such a restaurant no longer exists. And I even have my doubts about whether my friend's mom is remembering things correctly. Can anyone recall a place like this? It could be from as recently as four years ago; that's how long I've lived in Chicago.