I LOVE Liebman's! Their food is delicious and they are very careful to keep my meals gluten-free and I've never gotten sick afterwards. They are very understanding about the seriousness of my gluten issue and are very accommodating, wrapping my reuben in lettuce.
There isn't anything dedicated gluten free on the menu, but I've ordered salads as well as grilled chicken with a baked potato and steamed veggies, and haven't had any issues. A bit pricey, but very tasty. Large portions as well. The chef salad lasted me for 4 meals! (I'm small and don't eat that much but 4 meals impressed me!)