In and Out Burger, a favorite of my son Teddy, mostly for the chocolate shakes, has a secret low carb menu. It’s secret because they don’t publish the choices on their regular menu. But it’s not so secret that the choices aren’t in their computer system–they track every one of these orders. The “protein style” burger is a cheeseburger with lettuce instead of the bun:
Wikipedia claims people started ordering this burger in the 70′s. Who knows. The “Flying Dutchman” is a double burger with cheese in the middle:
So if you are caught short on low carb food while out and about–stop in at In and Out Burger where they are used to people ordering burgers without the bun.