Good Karma is an amazing (small) vegan place in 1st Street, a 12 min walk to the Convention Center. Last year I did bring some (non vegetarians) friends here during WWDC and they still talk to me, so the food is ok for non vegetarians too :).
I just had a delicious Jamaican Je4k with Chana Masala and Kale (with quinoa)
No boring numbers for your food here
But it does get crowded easily (there are some seats outside):