Water spinach, or watercress, in a spicy sauce

Kangkung is one of my favourite vegetables, and in South-East Asia it is so common and grows so easily that it is also one of the cheapest. My husband never got a chance to taste it for the first year or so that he was in Indonesia, because he was still a bachelor and his Javanese cook considered kangkung to be beneath the dignity of a foreigner, particularly if he was also a teacher. In fact, it has an excellent flavour and is also good for you