In addition to its simple menu, the popular fast food chain In-N-Out Burger also has a wide secret menu. One item on this menu is the "Flying Dutchman" burger.

This cheeseburger contains no bread or vegetables. Instead, the order consists of just two hamburger patties with a couple of cheese slices in between them.

The patties essentially serve as the buns, though one popular variant that went viral adds grilled onions for buns, with the two beef patties and cheese slices as the filling.

To get grilled onion buns, you must specifically order the Onion Wrapped Flying Dutchman. You can also order your Flying Dutchman Animal Style.

A Flying Dutchman can be between $5 and $6, costing the same or slightly less than a Double Double. However, the fee varies, as items on the secret menu don't have a set price.