Over P. J. Clarke's Bar

How did a bar like P. J. Clarke’s saloon become the beloved watering hole for Frank Sinatra, Marilyn Monroe, Jacqueline Kennedy, Rocky Marciano, and Buddy Holly (not to mention the fictional Don Draper)? And what was it about their bacon cheeseburger that caused Nat King Cole to pronounce it “the Cadillac of burgers”?   

Established  in 1884 and bought in l904 by Patrick “Paddy” Joseph Clarke, thi...