Add half portion of drained rice into a mixer grinder.
Add half of grated coconut.
Add half of cooked rice.
Add required water (approximately 1/2 to 1 cup).
Grind till the mixture is really smooth. It should not be grainy.
Grind the remaining portions and pour into a wide bowl. Add required salt and mix well. The batter should be in a thick pouring consistency. Adjust the water accordingly.
Heat a pan till hot. Drizzle a little oil and rub it all over. Take a ladle of batter and pour. Spread it quickly. Close the lid and allow it to cook for around 5 minutes on small flame or till done. The dosa will lift up from the pan and will be non-sticky when touched. Do not allow it to brown.
Repeat till the batter is done. Serve warm with a side dish of your choice.