Update: their quality control is almost non existent at this point. No matter how many times you say no bun and they confirm it you'll still probably get a bun. Very unfortunate. Original: I always order the cheeseburger minus the bun. I love that I can eat their French fries!
Food is really good, however it would be way better if they had buns. If they had buns, I feel cross contamination could be a nightmare as well. I did not get sick, but it was not fun eating hot dogs and Italian beef without bread. if you want a hot dog I recommend Frank's on first in Hinsdale.
They didn't have a clue about gluten free options. Online menu had breaded chicken and wraps listed with no gluten allergy, but at least had the wheat allergy ticked. They were so busy at supper there was bread all over the place in the preparation areas. Skip it if your serious.
Portillo's is a great option for gluten free fast food! They don't have an official gluten free menu (although I hear that one is in the works) but the hot dog nudie, hamburger nudie, or cup of beef are great options. You can't do a chicken nudie because it's marinated with soy sauce (weird, I know). I've never ever gotten sick from the hot dog nudie (with cheese sauce for dipping!) because they use tongs for the hot dogs and their hands for the buns. Workers hands never come in contact with the hot dog because of paper the hot dog is wrapped in – and you can watch it all through their window to make sure. There's some minor cross contamination risk to the cup of beef just in watching that the bread sometimes goes over the top of the pot of beef. However, I've never gotten sick here and I'm an extremely sensitive Celiac. The salads can be made in a fresh bowl, and the famous chop salad is GF without the chicken or pasta. Also, the fries are made in a dedicated fryer! The onion rings have their own fryer with separate oil.