Preheat the oven to 180 C/350 F/ Gm 4. Heat the oil in a work or a large shallow saucepan, and fry the onion, garlic, chillies and coriander, stirring continuously, for 2 min. S. Add the rest of the ingredients, except the courgettes. Let this simmer for 3 min. S, stirring occasionally. At the end of this time almost all the water will have been absorbed by the desiccated coconut. Reserve about 4 tbsp of this coconut mixture. Add the courgettes to the to the remainder, stir and turn them around for 1-2 min. S so that they are all well coated. Transfer the whole lot to an ovenproof or gratin dish, level off the top with a fork, and spread the reserved coconut evenly over it. Then bake uncovered, for 15 min. S. Serve hot with a main course.