1) Fry the chopped onions and garlic in a pan.
2) Once it is fried a bit, add tomato and let it fry.
3) Add the turmeric, chilly, coriander, pepper and salt to it and fry for a mintue.
4) Finally add the prawns and curry leaves and fry until the prawns are well cooked. (To test if the prawns are cooked, try to cut the prawn, if you are able to cut it, then it is well cooked)