The vegetarian and vegan meals here are nice. We usually get the vegetarian spring rolls and a spicy green curry with rice. The Phad Thai is also good but make sure they leave out the egg. They have vegan rice noodles.
Waiters are rushed and pressed for time, so make sure they hear and understand your request, perhaps even write it down.
A big perk of Simply Asia is that the meat ingredients in dishes are interchangeable with meat substitutes, so its entirely possible to have anything on the menu as vegetarian and many options as vegan, sauce depending.
The food arrives quickly, whether at your table or in a paper bag.