Marinate prawns with ¼ teaspoon salt & ¼ teaspoon turmeric powder and set aside for 1 minute.
½ kg medium prawns, 1 teaspoon salt, ½ teaspoon turmeric powder
Dry roast red chillies & whole spices for 3-4 minutes till they are lightly roasted and aromatic. Transfer to a plate and allow it to cool.
8 kashmiri red chillies, 3 spicy red chillies, 2 tablespoons coriander seeds, ¼ teaspoon mustard seeds, 1 teaspoon cumin seeds, ¼ teaspoon fenugreek seeds, ¼ teaspoon carom seeds, ¼ teaspoon black pepper corns
Once cooled, transfer the roasted red chillies, spices, grated coconut, onions, garlic, remaining ¼ teaspoon turmeric powder, tamarind and 1 cup of water to the mixer and grind to a thick smooth paste.
1 cup grated fresh coconut, ¼ cup onions roughly chopped, 7 - 8 garlic cloves, ½ tablespoon tamarind, 3 cups water
Add the ground paste to a kadai or pan, add a cup of water to the mixer to wash out all the masalas & add to the kadai. Dilute with another cup of water.
Heat the kadai on medium heat, add the remaining ¾ teaspoon of salt and boil the curry for 5 minutes.
Add prawns, mix and cook for 4-5 minutes till they are cooked, but not overcooked as they turn chewy. (Refer note 6)
For tempering, heat oil in a pan, add onions, green chilli, curry leaves and fry until onions turn light golden.
1 teaspoon coconut oil, ½ cup sliced onions, 1 green chilli, 15 curry leaves
Add tempering to the curry, boil for 2 minutes and serve.