I got a rebuen pastrami stacker with GF bread.
As the waiter was walking away with my order, I stopped him and asked what my meal came with. He said fries. So I asked him if those were gluten free, and he said no. So I asked if I could substitute something and he said I could (I got coleslaw). He also brought me mustard which I had to scan to verify was GF, and it was not.
However, the sandwich was delicious--flavorful, perfectly browned bread, and a size that definitely filled me up.
They also have GF bakery items like chocolate cake, cookies, etc., and their menu makes it sound like they really try to be accommodating and conscientious of food intolerances.
There technically isn't a GF menu, but there is a separate page (on request) that says what is GF on the menu and also lists GF bakery items for sale.
— Not very
— Gluten-free items are marked on the main menu
— Most/All
— Excellent