Went Friday based on recs here, but for some reason, can't find them anymore, so this might just cover old ground:
Nirvana is all vegetarian, Indian place about two blocks west of farragut west stop. Decor is nice, looks new. They are unique in offering a lunch buffet that highlights dishes on a regional basis, rotating daily. Clever concept, as now I'm obligated to come four more times to see what the others are all about. Friday was Rajasthan, a northwestern province bordering Pakistan. On the buffet: cabbage Pakora (fritter), 4 types of Dal (lentil dishes), one Biryani (rice dish) and a dessert, don't remember name, but appeared to be made of whole wheat, sweet, tinge of cardamon. Offering was generally in the "Good" range, I REALLY liked one of them, can't remember name. Number of dishes, much less than Ascot close by, but how much do you need anyway?. Traditional copper bowls and serving plate. Buffet was $9.95, but would suggest adding a puri (fried wheat bread) for scooping, as no breads on the buffet--they'd be stale anyway. I didn't find it crowded, even after 12pm. Owner in traditional garb took time to explain dishes. They just started up a website, I think, as it was handwritten on the takeout menu, provided below.
Definitely a winner, along with other CH board finds I've tried recently: Tosca, Burma, Kanlaya.