p.s. find out where your local Chinese supermarket is - most sell wholesale AND operate as a little supermarket too. The difference in price is ridiculous - get all your spices, fish sauce, coconut milk and fresh produce there if you can. My local one is madly cheap, and I've discovered the most amazing things there too - tofu freshly made every day; and awesome veggies. This is a cheap dish once you've got your spices sorted.

p.p.s thinly sliced spring onions scattered on top is a great final touch.