You can find all their menu ingredients online on their website. A lot of GF options. When I got there, I asked if I could get a GF bun on my burger. Staff wasn’t sure, but looked it up and said they could. So my advice here would be to do your research ahead of time and know what you can get before you go.
Probably one of the best GF buns I’ve had. Great burger and fries all Gf.