Marinate the prawn or shrimp with the lime juice, salt and turmeric
Grind all the dry spices together and add the coconut, some water and grind again
Heat the coconut oil and sauce the onion
Add the mustard seeds and curry leaves and allow the onion to turn a golden brown
Add the ginger and garlic paste
Add the ground masala and saute
Add the prawn or shrimp and allow it to cook
Add the water and the tomato paste