This place may not seem very vegetarian friendly with a name like Viva Chicken, but there are definitely vegetarian options - to my delight.
Every time I've been here I've ordered the Viva Tacu Bowl. It's that good. (I have heard good things about the meat dishes from my omnivore friends, so if that's your thing - then I'm sure you won't be disappointed)
If you've never been here, heads up - it's more of a fast casual place (opposed to a more traditional 'sit- down' restaurant) and the prices fortunately reflect that.