Skin & Remove the heads from the prawns & also remove the back veins .
Wash well in salt water & drain dry
Mix with turmeric powder & keep aside for 10 minutes.
Now heat some oil in a pan & fry the Prawns crisp with some Salt.
Remove the Prawns from fire & Keep aside
Pour the mustard oil in a pan now & allow it to become hot.
Fry the onions until golden brown & add the ground paste masala to the onions & fry for few minutes ,then add curry leaves & the vinegar slowly.
When the vinegar starts to bubble ,add the prawns & Salt to taste.
Turn down the fire & allow the prawns to simmer until the mixture is dry.
Remove from the fire & allow it to cool completely.
Then store in a glass jar in the refrigerator until required.
Grind to a paste:
12 Cloves Of Garlic
12 Dry Chillies