For preparing chemmeen roast masala, first marinate prawns with 1 tsp coriander powder, 1 tsp ginger-garlic paste, pepper, 1 tsp chilly powder and turmeric.

Marinate for 1 hour. Fry it in oil and keep aside.

Heat kadai and pour same oil. Add garam masala, onion and green chillies.

Add ginger-garlic paste and tomatoes.

Fry well. Add coriander powder, chilly powder and turmeric.

Add curry leaves and coriander leaves. Add the fried prawns, vinegar and soya sauce. Mix well.

Sprinkle little water to make a semi masala(add salt if required).

Chemmeen roast masala is ready.