A nice place, quiet at night. The best veg*n option at night in Vientiane in my opinion. There's lots to choose from on the menu, including plenty of interesting Vietnamese dishes. I went twice and tried the pho soup, which was nice and the Vietnamese stuffed bitter melon soup, which was tasty and interesting.
The restaurant itself has a nice atmosphere with colourful decorations and lots of photos of a happy monk called Master Ruma. Prices are inexpensive, ranging from 15,000 to 25,000 kip.Pros: Vietnamese dishes, Open at night