It's true. Off in a corner of the Parker-Meridian hides a burger joint called, appropriately enough, Burger Joint. If you enter through 57th St., make a sharp right before the front desk (just past a set of curtains) and you are there, even though it isn't marked as of yet.
The menu is spare: hamburgers, cheeseburgers, fries, milk shakes.
The good news: the burgers are delicious and made to order on a grill. Fries are standard-issue. My friend's vanilla milkshake was nondescript. But what a find! In the middle of the high-rent 57th St. district lies a place where you can get an excellent sandwich for $5 for a cheeseburger, $4.50 for a hamburger.
Bonus: the Parker-Meridian is a great place for celebrity spotting. Found within 15 minutes -- James Caan and John Favreau.