Whataburger

Whataburger is a Texas fast food restaurant with locations all over San Antonio.  They have one of the best fast food burgers, which is GF if you order it without a bun.  They are very familiar with ordering a burger without a bun.  They serve it in a tray with all the toppings on the side.  It looks like a salad.  The fries are also GF, but they do sometimes share the fryer with other items.  Their menu lists foods without gluten and offers suggestions for eating GF.  I have included a picture of my usual order, a Whataburger with cheese (no bun) and fries.

They have locations all over San Antonio.