For preparing prawns vattichathu, boil water in a vessel, add washed deveined prawns, ginger pieces, garlic pieces, green chillies, 1/2 tbsp kashmiri chilly powder and salt. Allow it to cook for 7 minutes, set it aside and allow it to cool.
2)While cooling down, add 3 drops of vinegar and set it aside.
3)Remove the prawns aside and keep the broth for later use.
4)In a kadai/dry fry non stick pan, add oil and stir in the small onions. SautT till it becomes brown.
When the entire mix starts to turn brown in color, pour in the broth that was used to boil the prawns and allow it to dry up.
8)Finally add a little more oil as required and stir dry.
9)Prawns vattichathu is ready. Serve hot.
Note:-
1)If you are lazy about deveining prawns:-
Simmer in water for 3 minutes with turmeric powder. Turmeric acts as a disinfectant. De-veining the prawns then becomes an easy task.
Wash thoroughly in cold water and set aside.