Suan Plu Mangsawirat Vegan Canteen
Amarin Plaza's food court is your typical mall collection of eateries, but there's a vegetarian food stall stall worth seeking out if you're in the area around lunchtime. It's not 100% vegan, but it's pretty obvious which dishes aren't suitable (e.g. the stack of eggs). The selection of dishes is reasonable and inexpensive, at around 40 baht for a large plate of food. Also be sure to check out Fresh Up Juice Bar, also in the Amarin Plaza food court, a vegan friendly sweets stall with desserts for around 20 baht.
The Eats
Aubergine and Tomato nam prik with Soy Larb at Amarin Plaza Food Court
One of my favourite discoveries, and one I managed to replicate pretty well in my own vegetarian nam prik ong recipe, this rich and salty entrée is highly recommended.
Sticky Black Rice with Salty Coconut Milk from Fresh Up Juice Bar
I'm a sucker for Thai sweets, so even if I'm full to the brim I'll still take anything that's available. Fresh Up Juice Bar has a variety of combinations from which you can choose, but I went with a simple bowl of sweet black sticky rice with salty coconut milk. All the love.
The view from Amarin Plaza food court
If you want a cheap, cheerful, and tasty lunch around Pathumwan or Lumphini then consider the vegetarian options at Amarin Plaza. It's hyper busy at lunchtime, as are most places, but if you can manage a table with a view it's a good place to enjoy some air conditioning and people watching on the streets below.