Mix the dried and fresh prawns together, salt and keep aside.
Slice the bilimbis, add a handful of salt and let it drain.
Heat 2 tablespoons of oil in a pan.
Crush the ginger and garlic and fry over slow fire in the heated oil.
Slice the onions, and fry along with the ginger and garlic, till brown.
Remove the mixture in a bowl and keep aside.
Fry the blimbis in the remaining oil in the pan till they change
color. Remove from the pan and keep aside.
Add ginger and garlic and fried onions back to the pan.
Add the prawns, mango seeds and green chillies and fry.
Extract thick coconut juice and keep aside.
Then take about 1½ litre of thin juice.
Take 4 to 5 tablespoons of the above sambhar masala and blend well with the coconut juice.
Add it to the prawn mixture in the pan and let it boil well for about half an hour. Then add the thick coconut juice, bilimbis, sugar, maggi cubes and ½ cup tamarind water. Let the mixture cook well. Add salt and sugar if necessary.