i'm vegan, so everything i mention here will reflect that. i dont give a **** how good a restaurant is if they dont have anything vegan.
i've been to udupi a few times. its in the same strip mall with 2 other indian restaurants on the northwest side. everything is vegetarian, but a lot of stuff isn't vegan. they are pretty good about telling you what is and what isnt if you ask. i've only been there during the buffet, so i dont know if they have non-buffet style service too. i guess indian food is regional, but i dont know which ones are from where. udupi tends to have things that are creamier. india palace (in the same strip mall) and india garden (one downtown and one in broad ripple) tend to have more solid foods. shalimar is good too, but i've only been there once. india garden is my favorite for buffet because they almost always have chana masala or dal makhani(sp? the lentil thing).
three sister's cafe in broad ripple has a lot of vegetarian stuff. their chili is vegan and decent, and for breakfast they have calico hash which is very good. vegetarians will have no trouble finding something there, but vegan is a lot more limited.
the abbey coffee house (intersection of st. clair, massachusetts, and college) has a great vegetarian and vegan menu. they have been adding a lot to their vegan menu lately. the vegan tostada is really good, and the vegan peanut butter cookies are good. the vegan chocolate raspberry cake kind of sucks in my opinion, but other people seem to like it. nice atmosphere.
cheng du (86th and township line) is the ****ing place for lunch. FOUR god damn dollars and you get soup, and entree, and real cloth napkins and everything. vegetable soup is vegan, and i'm pretty sure everything on the vegetarian menu is vegan(about 10 items). they have vegan kung pao chicken (seitan), vegan chicken with cashew nuts, sesame bean curd, etc. you cannot eat this well for less than four dollars. if this place werent 25 minutes away i would eat there every day. dinner is like $8 i think. closed on mondays. this is probably the best value in indianapolis for good vegan food.
thai cafe (broad ripple ave.) great thai place. massaman curry with red rice is really good. padd thai, etc. thai house is also good. i've heard thai garden on south meridian has an all-vegan buffet for lunch, but i dont know if thats true or not. i've never been there. i think the buffet is $10 or $11.
maybe i'll think of more later. if anyone can contribute to this list that would be awesome.