Rinse raw rice well with water. Soak the rice in 4 cups of water for 10-12 hours.
Drain the water and add the rice to a blender along with coconut and ¼ cup of water.
Blend to make a very smooth batter. Scrape the sides of the blender a few times while blending.
Transfer the batter to a large mixing bowl and add 1 teaspoon salt to it. Mix well to combine. Now add 3 cups of water to the batter to make it really thin. The consistency of the batter should be like milk.
Heat a non-stick griddle over medium heat. Brush it with very little oil.
Stir the batter well and pour a ladleful of it from the outside towards the inside. Pour more batter in the gaps.
Cook the dosa uncovered for 2 minutes or until it is set. Once you start seeing the edges leaving the pan, the dosa is ready. This dosa is white in color and is soft not crispy.
Fold the dosa in half and then into a triangle. Serve hot with any chutney or curry.