Heat 2 tablespoons of the reserved onion-frying oil and 1 tablespoon ghee in a heavy-bottomed pan.
1 tbsp ghee, 2 tbsp oil
Add the whole garam masala (cardamom, cloves, bay leaf, cinnamon, mace, and star anise). Sauté for about 30 seconds until fragrant.
Whole garam masala
Add the crushed ginger, garlic, and green chilies. Sauté for 1 minute until the raw aroma disappears.
Add the sliced tomatoes, cover, and cook until soft and mushy.
3 tomatoes
Reduce the heat and add the turmeric powder, Kashmiri chilli powder, black pepper, salt and garam masala. Sauté for 1–2 minutes until the spices are well roasted.
½ tsp turmeric powder, 1 tbsp Kashmiri chilli powder, 1 tsp black pepper, 1 tsp garam masala, Salt
Stir in the curd and mix well.
1 ½ tbsp curd
Add three-fourths of the fried onions, followed by the chopped coriander and mint leaves. Mix well.
1 cup chopped coriander leaves, ½ cup chopped mint leaves
Add the prawns and salt. Mix gently, cover, and cook for 4–5 minutes. Do not overcook the prawns, as they will continue cooking during the dum process.
500-600 g medium or large prawns