In a wide bowl, take the rice flour. Add a pinch of salt, mix well & set aside.
Boil water adding a drop of gingely oil.when the water starts to boil, initially you can see some small bubbles on the bottom and sides of vessel. After few minutes, water will start to roll boil with big bubbles. Switch off the flame as soon as water starts to roll boil with big bubbles.
Add the boiled water to the rice flour little by little and mix well. Rice flour may not take all the water. Stop adding water as soon as you get a non-sticky dough. If u feel the dough is dry, add little more hot water. Make sure the dough is not sticky. Knead the dough when it is warm. Make small balls of seedai size by greasing your fingers. Cover it till use.
Now boil water in idli pot or in a kadai. Grease the idli plate with oil and spread the balls. If you are using kadai, keep the balls in a small plate. Place a small wide bowl and keep the plate over the bowl. Cover the kadai and cook for 5 – 10 minutes.
In the mean time, mix 1.5 tbsp of coconut milk powder in 1/2 cup of boiled n cooled milk without any lumps. To this add sugar, saffron thread and cardamom powder. Stir well.
Allow it to boil for 2 minutes in medium flame. Milk will thicken slightly. To this, add the cooked rice balls and boil for few seconds.
Remove and serve warm or cold.