You can get a GF burger on a plate with greens or stop at Whole Foods for GF bread or HB buns and bring your own bun. Just order the GF burger on a paper plate with the onions and cheese and put together your own.
One of the best burger's I've ever had.
This was a great place to eat gluten free! I was able to talk to the guys cooking through their screened in area and able to see everything being cooked. They answered all my questions and reassured me that they were aware of celiac and the need to be gluten free. The turkey burger was wonderful as well as the salad!