Rinse idli rice and urad dal and soak them separately in enough water for 3-4 hours [ better soak it overnight].
Drain them well and grind it adding enough water. The batter should be thick like the idli batter.
Pour the batter in a deep bowl and add sour curd. stir well and keep the batter in a warm place to ferment overnight or for 7-8 hours.
Before preparing the dhoklas, grease the plate in which you will be making the dhokla with oil. And add water in your steamer and let the water come to a boil.
Add salt, oil, ginger and chilli paste to the batter and stir well. Now add eno fruit salt or baking soda to the batter and a spoon full of water if needed. [ Be quick enough to stir well, so that the fruit salt is distributed uniformly in the batter]
Pour the prepared batter in a greased pan. And sprinkle with black pepper, red chilli, cumin powder and roasted sesame seeds.
Place it in the steamer. Cover and steam for 20 minutes. [ Do not open the steamer in between.]
To check if dhokala is cooked, insert a toothpick in the dhokla. it should come out clean.
When done remove the plate from steamer and keep aside.
Slice and serve with coriander chutney.
