Check your cooking surfaces.
If using the oven, cover your pan with aluminum foil, this prevents cross contamination between the glutened pan & the non-gluten food. In addition DO NOT cook anything with gluten on or in the same pan. This with make the non-gluten food glutened and then you will have wasted your time.
If grilling out. Use a separate flipper for the non-gluten food than for the gluten food.
Make sure to have a dedicated area on the grill for the non-gluten food, this area must be covered in aluminum foil (again to prevent cross contamination).
Once the gluten free dairy free food has been cooked, please make sure that it does not come in contact with other food that may have gluten or dairy.
Taking these steps to make sure that a meal is gluten free (and/or dairy free) for an guest with Celiac is very important, and very much appreciated. A key to remember is that even the tiniest speck of gluten can make some people with Celiac very sick, so always use caution when making food for a Celiac guest.
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*Disclaimer: This is not an attempt to treat, diagnose or give advice regarding any disease. This is purely for entertainment purposes only. These are things that have worked for me personally in my own life, I am only sharing my own life experiences. As always talk to your Dr when dealing with an illness. In addition, these are not my photos they are photos gathered from around the web for illustrative purposes only.*