This classic Thai vegetable dish is wonderfully sweet and crunchy. Morning glory, also known as water spinach, is a vegetable from South East Asia, and not to be confused with the British plant known by the same name, which can be poisonous. If you can’t find morning glory, you can use spinach instead. Serve this as a side dish (it’s delicious with our Thai fried rice), or with steamed rice as a veggie main course (but note that, because of the fish sauce and oyster sauce, it’s not strictly vegetarian).