My wife order a tortilla soup and I ordered a burger. My wife has a gluten allergy which she told the waitress which she acknowledged. I do not have any allergies, so I didn’t say I did. When my burger arrived, it was missing the bun. My wife soup also arrived with two pieces of regular bread, even though she advised the waitress her order was gluten free. I asked the waitress to just put the bun on, which seemed like a simple ask. When she returned, she brought a brioche bun on the side, and let me know the kitchen can’t put the bun on because it was already made. I found this extremely unacceptable since this was an error on the waitress part for not asking me if I had an allergy. In addition, unacceptable that the kitchen can’t fix a mistake.