Boil the water with salt in a large saucepan, add the rice and cook for about 10 minutes, remove from heat, stir and cover the rice with a dishcloth and the lid on top. After 15 minutes the rice is ready for the seasoning to be added: add knob of butter, a little of the oil used to fry the cray-fish and Parmesan cheese and nutmeg if required. Once the rice has been stirred well, it should be served on a hot plate with the crunchy fried fish on top.