If you're a tourist on a short visit you're unlikely to come to Kowloon City. However, if you live in Hong Kong, you should allocate a half day to wander around the Walled City Park and then explore the Thai restaurants and shops to the south. The area doesn't have an MTR stop (yet) but it's easily accessed by bus or minibus.
There's no shortage of Thai restaurants in these few streets, but this is the only vegetarian one I've found. The food is fresh and delicious. I highly recommend the fresh spring rolls, pomelo salad and rice with chili leaves (this is a little spicy, but overall the food isn't very hot). Like virtually every veggie place in Hong Kong they use various types of fake meat, but if you hate it rest assured the dishes come packed with tofu and vegetables as well. The only thing I don't like is the drinks, which have a very odd aftertaste.
Note that the place is very small, so don't come with a large group, and (again, like many places in Hong Kong) the setting is purely functional, not a place to relax over dinner for a couple of hours. They will take takeaway orders but sometimes decline if it's very busy. The menu is in Chinese, English and Thai (I speak enough Chinese for ordering in restaurants so I've never noticed if they speak English or not, but they probably do).
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