Clean and joint duck.  Grind together chilly powder, coriander powder, pepper and turmeric.  Slice onion.  Crate coconut and take three extraction of coconut milk.  Heat oil, add sliced onion and ground ingredients saute.  Add duck, fry for 5 minutes.  Add salt and third extract of coconut milk and vinegar and boil.  Simmer.  When the duck is nearly done add second extract of coconut milk.  Simmer for 5-10 minutes.  Add first extract.  Boil and remove from fire.  Heat ghee and add crushed cinnamon, cloves and mustard seeds.  When the seeds crackle, pour over the curry and mix well.