Not much other than that. I think is Hardees that offers a low carb
burger.
I haven't seen one, but I heard its a burger wrapped in lettuce.

It is. It's called LC Thickburger although the burger isn't very thick.
About the same size as their sandwich meats. It was kinda cool going thru
the drive thru. Pull up and they say, "would you like to try our new low
carb thickburger today?" First time I heard anyone offer a LC as their
special.....lol.