Wash raw rice, urad dal along with fenugreek seeds with enough water in a bowl for 6 hours.
When ready to grind, drain the water from the rice and grind in a grinder or mixer by adding water as required.
Finally, add the cooked rice and continue to a grind to a form a smooth batter.
Transfer the batter into a mixing bowl, add coconut milk, sugar and mix thoroughly.
Keep this batter covered in a warm place.
After fermenting overnight, add the salt to taste and baking soda and mix well.
Grease the idli plates and pour the batter in the plates.
Steam the idlis for 15 minutes. Check if cooked and gently remove the idlis to a box.
Serve the Kodava Thalia Puttu along with side dishes.