First of all marinates the prawn with salt and ginger garlic paste. Take a handi add coconut oil and deshi ghee in 1:1 ratio.
Add 2 tsp sweet spice powder (cardamom+cinnamon+clove).
Add bay leaf, chopped ginger and slit green chilly.
Add sliced onion and stir it cook till it become light brown.
Now add salt, pinch of turmeric powder, red chilly, ginger, and garlic paste stir it properly
Add sliced tomato, coriander powder & garam masala powder.
Add prawn & curd mixes all of these properly.
Now add soaked rice stir it add water and stir it.
Dry excess water now adds chopped coriander and mint and brown onion and saffron.
Cover handi with silver foil and keep on dum for 10 min.
Serve hot chetinaad prawn biryani with garlic raita and garnish with mint leaf and green chilly.