I've always enjoyed the meals at Lemongrass but I'm not so sure I trust their understanding of the vegan concept. I always make a point of asking that no fish sauce or animal products be used and the servers always seem agreeable but I'm still a little nervous....
Having said that, the Monk's Favourite is one of my favourites and if you ask for it to be spicy, it'll make you sweat. Tofu In Ginger Sauce is a good choice as is the Vegetables Cashew. They'll make veg pad thai without the egg if you ask but again, not sure about the fish sauce.
Service can be a bit iffy at times and they get VERY busy at lunch so you should show up at 11:30 or 1:30.
Cons: not sure of the ingredients sometimes, VERY busy at lunch so service can suffer, not much atmosphere