Grind the mustard seeds
turmeric, ginger and garlic to a paste. Heat the oil
and fry the ground mixture for 2 minutes.
Add the chilies and fry until
browned. add the onions and fry until soft, adding a
little water occasionally.
Stir in the coconut milk and
salt and simmer for 3 minutes. Add the fish and
simmer for about 15 minutes until the fish is
tender, stirring occasionally and adding a little
more water if necessary.
Garnish with the coriander and
serve with rice and dal.