Questions on here are generally answered by other Google guides. Specific questions like these you just need to call them directly.
I have allergies and sensitivities and they worked with all of my restrictions. Call the restaurant direct for exact info. Sometimes things are marinated beforehand.
I bet they would accommodate that request. I agree with SamuelL. though, you should call them and speak with a manager.
I've only eaten there once and the burger and empanadas should be ok
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