The server told me about a few gluten free options. I did not eat the "gluten free" salad because it was brought with fried pieces on top. He could not confirm if the fryer was gluten free. I ate the pad Thai with chicken. The food tasted good, but I had abdominal pain and bloating soon after. I would not recommend Zen for any one who is sensitive.
The food was pretty good and the service was excellent. The waiter was knowledgeable about the menu and was able to tell us which items included soy sauce and/or gluten and which did not.