Soak the urad dal, tapioca pearls, flattened rice, fenugreek seeds, channa dal separately for 4 hours.
Soak the rice separately for 4 hours.
Grind the soaked mixture containing urad dal with about ½ to ¾ in a grinder till it turns smooth and airy. This would take about 30 minutes approximately.
Once done, take out the batter and add the soaked rice.
Grind the rice with about 1 cup of water to a point where it just starts turning smooth. This might take approximately 15 minutes.
Once done take out the batter and mix the rice batter to the urad dal batter and mix the two with your hands. This process will kick start the fermentation process.
Once mixed well, add salt and sugar and mix again. You can add more water (about 1-2 cups) to adjust the consistency of the batter.
Leave the batter to ferment for about 8-10 hours. This will double or sometimes triple the batter.
After the fermentation, mix the batter again.