Take 1 kg prawns. Take out the shell, heads and black thread.
I never take out the head. Wash it properly with 1/2 tsp haldi powder and salt twice and thrice. Drain it. Then transfer to a plate. Marinate the prawns with 1/2 tsp haldi powder, salt and 1/2 tsp mustard oil. Once it is done then keep aside... For paste : 1 chopped onion, 2 chopped tomatoes, 1" ginger, 2 green chillies chopped
4 to 6 garlic cloves, 2 green Elaichi, 2 cloves and 1" cinnamon stick. Grind it and make a fine paste...

Heat 2 tbsp mustard oil. Add 2 tbsp crushed garlic and fry for few minutes. Then add the paste. Fry till the raw smell of masala goes off. Then add 1/2 tsp haldi powder, red chilli as needed, 1 tsp coriander powder, 1 tbsp cumin powder, 1 tsp garam masala powder and salt as needed. Mix it well. Add water as needed. Cook till the prawns become tender.... then check it.

When it is done then transfer it to a serving bowl... Garnish with chopped coriander leaves