They are mostly corn based with a few exceptions and they do have a separate fryer for their chips and flour fried items. My server was very knowledgable and what she didn't know she went to management to ask. They made sure to clarify with me that the food was not prepared on a desperate surface and they didn't necessarily vet all the vendors whose food they used so I appreciated their honesty. I had the pork belly pastor and huitlacoche tacos and both were fantastic! The huitlacoche had corn truffles in it and was very earthy in flavor. I will definitely go back!