Marinate prawns with salt and turmeric - 10 to 15 mins.
Make a green masala paste with ingredients mentioned.
Heat oil and ghee in a large pot or pan over medium heat.
Add whole spices such as bay leaves, cardamom, cloves, and cinnamon stick. Then add one sliced onion and sauté until it turns golden brown.
Now add in one medium tomato chopped and saute on medium heat until it softens.
Add the marinated prawns and cook until they turn slightly pink. Also, add the green masala paste and cook for a minute until fragrant.
Now, add the soaked basmati rice and gently stir to combine with the prawns. Add freshly crushed peppercorns.
Pour in the coconut milk. Season with salt to taste and add the lemon juice.
Bring the mixture to a boil, and cook until all the liquid is absorbed. Then reduce the heat to low and cover the pot.
Allow the pulao to simmer for about 6 to 7 minutes and then turn off the heat. Keep covered for another 10 minutes until the rice is cooked and the flavors have melded together.
Once the pulao is cooked, fluff the rice gently with a fork.
Garnish with freshly chopped coriander and mint leaves or fried onions for added flavor and texture.