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.