Idlis are the healthy breakfast for everyone, especially for babies. You can grind the fresh batter for idlis in few minutes often using the Blendtec.
Wash urad dal once and soak in water for at least 4 hours. Wash idli rice (parboiled rice) 2 - 3 times and soak rice and fenugreek seeds together in water for at least 4 hours.
After four hours discard the water from soaked urad dal and add the urad dal in a Blendtec jar. Add cold water little by little and grind it to a smooth batter. Choose batter option and grind for 3 - 4 times until the batter is smooth and fluffy. Transfer the batter to a wide bowl and set aside until needed.
Strain and discard the water from soaked rice and add rice to a blendtec jar. Grind the rice to a smooth batter (little coarse batter is fine) by adding cold water little by little. Choose batter option for 2 - 3 times and grind until smooth. Transfer the rice batter to a wide bowl with urad dal batter, add salt and mix well with hand.
Cover the bowl with a lid and set the batter for 8 hours or overnight for fermentation. After fermentation, the batter will rise in its quantity and the texture of the batter is light and foamy.
Mix the batter once with ladle and add water if the batter is too thick. Now the idly batter is ready.
Grease the idli molds with oil and pour a spoonful of batter in each mold and steam the idlis in Idli cooker for 10 - 12 minutes or until you hear the whistle sound.
Let the idlis in the idly cooker itself for 2 - 3 minutes and transfer the idlies to a serving plate using a spoon. Hot steamed idlis are ready to be served.