1. Take yogurt in a large bowl. add 1½ cups water and whisk well. add gram flour and whisk till the mixture is smooth. add salt, red chilli powder, turmeric powder and whisk till well combined.
2. Heat oil in a non-stick deep pan, add bay leaves, cumin seeds, fenugreek seeds, black cardamom, and sauté till fragrant.
3. Add sliced onion and sauté well. add a pinch of salt and sauté till the onion turns translucent. add asafoetida and 2 tbsp water and mix well.
4. Add white radish in the pan, mix well and cook for 1-2 minutes. add ginger-garlic-green chilli paste and sauté for 1-2 minutes.
5. Add the prepared mixture and continuously keep mixing for 1 minute. add 1 cup water and mix. add coriander seeds and mix well. cook till the mixture comes to a boil.
6. Add the white radish leaves and mix well. cook on low heat for 10-15 minutes. switch the heat off and transfer into a serving bowl.
7. Garnish with coriander sprig and serve hot.