Take a bowl and add mong daal flour and add water gradually and mix it well and make a soft batter (like a cake batter) and then beat it for 5 minutes and after that cover with lid and rest it for 15 minutes on room temperature

After 15 minutes remove lid and add baking soda and mix it well with hands

Now take a oil heated karahi and put some batter gradually with hands (like a small balls) and half fry it (apprixut will take 5 minutes) and when all batter is half fried then fry it again but completely until desir colour become, after that rest it for one hour in room temperature

Now soaked the phulkiyan for this take a bowl and add water and add 1 tbsp salt and mix it well and add this phulkiyan for 30 minutes

After that dry it's water with hands and go for making dahi phulkiyan. For this take a large bowl and add yogurt, black salt and mix it well

Take another bowl and add phulkiyan boiled potato, onion and tomato and then put yogurt (from step 5)and then put green chutni, chat masala, your dahi phulkiyan is ready.