If you have Hardees in your area, check out the low carb thick burger. Sometimes it's not posted on the menu, but it's there if you ask. It's essentially the "frisco" with the large outer leaves of a head of iceburg used as the bread. Though if you actually want it to be low carb, order it without the ketchup. Be warned, though. It's salty as hell and whether or not it's edible as a sandwich depends on how accustom the person is to making it.