Khai Minh is a godsend for vegans and coeliacs in HCMC - just pure, wholesome, great food. Was so refreshing to be able to take my coeliac mom somewhere to eat where she didn't have to worry about gluten lurking everywhere as the menu, as far as I'm aware, doesn't have any mock meat dishes. I love that all the food is made with brown rice (even the banh xeo and banh beo)and it's the only place where I've had brown rice noodles, which really makes such a difference. The noodle soup with turmeric is also absolutely delicious and I'd highly recommend it :-)
It's not got the cosiest of atmospheres and the staff don't speak English, but the menu is in English and whatever you choose, it's guaranteed to be of excellent quality. Morever, the food here is cheap, and I mean CHEAP. They don't skimp on portion sizes and I think the most expensive thing on the menu is 40,000 VND.
I've taken family and friends here and they have all said it's probably the best veg place I've taken them to, in terms of price and quality of food :-)
Cons: A bit out of the way (nr. Saigon Zoo)