This aromatic Thai dish has always been a favourite of my husbands, if he could get away with it, he would order it every time we ate at a Thai restaurant.. Many think that Thai food has to contain coriander to be authentic, but this far from the case. In fact Thai dishes contain many combinations of flavours. Holy basil is one ingredient that is used extensively in Thai cooking, giving food a sharp sweet flavour, it can be found at most East Asian grocers but if you are unable to obtain it use basil instead. This dish is very spicy but if you like you can omit some of the chillies.