we were at Ohana;s last week and absolutely loved it - but it is all meat - however, this being disney, I would be amazed if they didn't have a veggie option, even if it meant them creating something especially for you - I would ring disney dining and ask.
at boma we saw the chef giving a couple a guided tour of the buffet, sa they had some specific requirements (I think one was diabetic and the other allergic to tomatoes), and the chef talked them through every single dish telling them what was in each and which were not suitable - I was impressed, so based on that I would expect they had a veggie alternative
Bev