Went to this Longhorn with a friend the other day. They have a gluten free menu with intricate allergy detail on the pages after the menu. I asked to speak to the manager and informed him of my condition and asked that he make sure the chefs change gloves, use new utensils, etc... after I explained my condition the manager assured me my food would be safe, as he was going to cook it himself to ensure my safety. I had a grilled chicken sandwich (without the bun of course) broccoli (no butter sauce because it has bread crumbs) and a sweet potato.
It is now the next day and I feel perfectly fine. I also used to work at this longhorn and we always did our best to ensure the happiness and safety of our guests.