Knowledge staff and the gluten free bun tastes great! The fries are not gluten free but most of the staff warn you when ordering the GF bun. They do not butter or toast the bun as they do not have a separate area to toast. If you order a GF bun on the burger an no sides, then it is celiac friendly. Make sure to say it is an allergy and they will change their gloves and be considerate of the fact. Tested with our anima censor as Gluten Free.