Drain out water completely and wipe with a kitchen towel.
Marinate prawns with salt, turmeric, Kashmir red chilli powder and pepper powder and keep aside for half an hour.
Insert a tooth pick (soaked in water) from the head to the tail of each prawn (This will prevent the prawns from curling during cooking).
Heat oil in tawa or frying pan.
Arrange marinated prawns and fry on a slow heat till golden colour, while turning the prawns on both sides so that the spice powders are well coated on the prawns (Adjust heat low to medium and give enough time so that both the sides are cooked).
For Spicy stir fried grilled prawns: Heat oil in a frying pan.
Fry finely sliced onions till golden colour and fragrant.
Add curry leaves, sliced ginger and garlic and fry for 5 - 7 minutes on a low heat till you get a nice aroma of curry leaves and colour change.
Add turmeric powder and saute for 2 minutes.
Add tawa grilled prawns and adjust salt and pepper to taste (1/4 tsp).
Do not cover with lid. Fry for 5 - 7 minutes or until all the ingredients well mixed with prawns and fragrant.