I ordered a gluten free Shack, ate it and then decided to get another one. But when I ordered the second burger the cashier realized someone gave out the wrong order, because my lettuce wrapped (no bun!!) burger from my previous order was still lying there. She apologized, gave me a refund and the second (originally ordered) burger. When you go there, make sure that your order is without a bun and that it is lettuce wrapped because as she explained they don’t have real gluten free buns.