Wash the soaked lentils and rice in a colander or sieve, lightly. Leave about a tbsp of the dal on the side.
Mix sour yogurt with the measured water.
Using a bit of the yogurt water mixture, grind the rice into a paste. It should have the texture of coarse semolina.
Pour out the batter into a mixing bowl.
Using the rest of the yogurt water mixture grind the lentils into a paste.
Add the lentil paste to the rice one.
Add the tbsp of whole lentils that you left on the side. Mix it very well.
The batter should not be runny but should be thick. Usually the amount of water and yogurt mentioned above is sufficient.
Cover the bowl with a lid or cling film and allow the batter to ferment for 4 hours in a warm place.
Add salt, turmeric powder, asafetida, chilli, ginger, garlic pastes, ajwain, sugar and oil to the batter. Fold in the ingredients gently.
Cover and let the batter feremtn for 2 hours.