I'm gluten, dairy and soy free. It's hard to eat out when I'm on the road. However, in a pinch, 5 Guys works. Since their burgers are 100% beef and not seasoned and they only fry potatoes in their fryer, it works. I stay away from the mayo though since most have soybean oil as the main ingredient. They do give way too many fries and the food is expensive.
The burgers are good and the skinny fries are not bad.
I like how they have a turkey burger option and gluten-free and whole-wheat options for the bun. I haven't tried those yet, but I want to next time.