We've had many, many recommendations to go to Araya's Place in the past. I think it is the most recommended restaurant for this group that we have not visited.
Come join us for a wonderful lunch buffet:
Here's their menu: http://arayasplace.com/
Here's some Yelp reviews:
Review: Located across from the wayward cafe on university, Araya's has a delicious selection of vegan, vegetarian and gluten free items on their buffet line.
Review: I'm not vegan and Thai isn't my favorite food but this place is exceptional. Everything is so fresh -- the vegetables are perfectly cooked. When I want something healthy and fresh, this is where I go.
More reviews (they have 4.5 stars) on Yelp at: http://www.yelp.com/biz/arayas-place-seattle-2
Please keep your RSVP updated and cancel as soon as you know that you can't make it.