Judging by the one time I had the buffet lunch here this is probably the best "jai" (Chinese Vegan) restaurant in South-East Asia. It is certainly better than any of the other jai restaurants in Vientiane listed in Happy Cow. It is about a kilometer from the main backpacker area, in the direction of Patuxay Monument. I got a tuk-tuk there for 35,000 kip, and one coming back for 30,000 kip.
Updated from previous review on Monday November 16, 2015
Cons: it's a hike from the backpacker area