There is no GF menu but the burgers, fries, most shakes, and probably other items can be GF. They claim the burger grill is only used for meat. It took talking to the manager to confirm all this. The front-line cashiers do not seem to know about gluten.
I got the lettuce wrap for my celiac daughter and it was great. The server understood how she couldn't have meat that had been fried where a bun MIGHT have been and it was a great eating experience as someone who has celiac disease.
Included on the regular menu is an option to go bun-less or have a lettuce wrap! The food was excellent and they informed me their fries are fried in a fryer alone. They are only seasoned with salt and oil. Highly recommend for a meal where you feel "normal" and can eat among your friends.
You can get a burger or chicken sandwich plain or on lettuce. There is a dedicated fryer for the fries - regular and sweet potato. The staff is friendly and always takes the time to make sure our order is grilled without cross contamination with the buns. They are on a separate part of the grill.