Cafe Rio confirmed to us in June 2018 that their rice is not vegan because it
contains a margarine that contains whey. See:
https://www.caferio.com/nutrition/allergen-info
For info on other restaurant chains, see:
https://www.vrg.org/fastfoodinfo.php
For info on vegan and vegetarian restaurants, see:
VRG Online Veggie Restaurant Guide