Soak rice for 10 min. Boil shrimp with ginger in 6 cups of salter water till tender. Remove the ginger and use this water as stock. Saute onion slices till golden brown and add coconut, cardamom and cumin seeds, chilli powder and cook for about 5 min. Add rice to this. Add shrimp and the stock to this after about 2 min. Cook till rice is done. Garnish with cilantro leaves