Apply 1/2
the quantity of the ground red chillies, turmeric powder and
salt on the fish and leave for sometime.
Then
boil the fish and remove all the bones. Grind onions and fry
in oil till slightly browned. Add the flaked fish, remaining
ground red chillies, turmeric powder, salt and a pinch of
sugar.
Cook
till fish is tender and dry. Cut out the top from the
parvals and scoop out the insides.
Fill
them with the fish mixture and seal with a little kneaded
atta on top.