My wife and I love Zao since we both required gluten-free meals. They use GF teriyaki sauce, and we always get their chicken brown rice/ rice noodle bowls, without crunchy onions. For some spice, I would recommend getting their tiger sauce.
The rest of their menu items do contain gluten, but their normal rice bowls look small, but they are huge!
We frequent Zao often, and our only complaint is their app and rewards needs some improvement.
That shouldn't takeaway from how awesome the people who work here are, very welcoming and they keep their storefront tidy!