Royal Thai Garden Restaurant, 524 Bloor Street West, Toronto, Ontario, M5S 1Y3, 416.536.6868
I have ordered from this restaurant many times, usually when we are too tired to cook. Verifying ingredients may be a challenge, depending on when you call and if the person who answers speaks English well-enough. If you can get "no wheat" written on your order, you should be fine. You may get a better explanation while dining in, but I haven't done that in a very long time. A brief review is available here.