Heat oil in a saucepan. Add the cleaned prawns and saute till it turns pinkish and releases its stock.
Add the drained rice and saute for a couple of minutes.
Add the water, salt, pepper and cardamom and bring the mixture to boil. Keep on simmer and cook, while stirring occasionally till the rice is well done, sticky and has absorbed all the moisture.
Switch off the flame, add the cream and blend the mixture with a hand blender till smooth.
Serve hot topped with melted ghee.