Wash and soak the dhals separately overnight
Rinse the dhals and drain all the Water
Grind the Urad dhal using minimal water and remove on a large flat dish
Grind the Moong dhal reserving the extra tablespoon with little or no Water and add to the same dish
Mix the two together and keep aside for 10-15 mins
Prepare the tadka by heating some oil and sautéing the Mustard seeds, followed by the reserved Moong dhal, sliced Chillies and Curry leaves and keep this aside
In the same pot, add some more Oil and add the red Chillies, Cumin seeds, Asafoetida, Ginger, Curry leaves and Chilli powder
Add half the Water, the Salt & Sugar and bring to the boil
Allow to cool and add the other half of the Water
Set a timer to 15 mins and start whipping the batter by hand, incorporating air into the batter in one direction
You will notice that as you whip it, it gets lighter
Once done add the red and green Chillies, Chopped Ginger, Salt and Baking powder and mix
Heat oil till it’s moderately hot and drop in little morsels of the batter
Cook this on moderate heat for 5-6 mins till it’s cooked low and slow and the exterior will slowly get golden brown
Once this is done, remove with a slotted spoon and add to the soaking liquid that should now be at room temperature
Allow the Bhallas to soak for 20-30 mins
Remove to make room for the rest of the batch then they are soaked, squeeze to remove extra liquid and keep aside
Whip together the Yogurt with the Sugar
To assemble, add a little yogurt at the bottom of a shallow dish, and fill it with the Bhallas
Add the Yogurt to cover the Bhallas and then add the tadka, the Pepper, Chilli powder & Chaat masala, green & Tamarind chutney, Sev & Boondi and Coriander