While viviting Detroit for the holidays,
my nephew took me to "The Ham Place".

It's a tiny cinder-block "diner",
inside a counter and about 20 stools.

They have FOUR items on the menu.... that's it.

Breakfast; Ham and eggs of your choice.
Lunch; Ham Sammich ( about 2" thick, on rye )
Pea soup with ham
Bean soup with ham.

The ham is superb, the portions are generous, the prices are fair.

The place is packed with customers
from morning 'til closing time at 3pm.

What a simple business plan !
Pick one thing, do it well, and charge a fair price.
I wish more eaterys were like that.