Break the potatoes, by holding each in the palm of your hands and closing the fist.
Set these unevenly broken potatoes aside, till required.
Heat the clarified butter and add the cumin seeds and asafoetida.
When the cumin seeds begin to splutter, add the ginger and saute till lightly fried; then add the tomatoes and stir-fry till the fat separates.
Add the garam masala, coriander powder, salt, turmeric and chilli powder.
Stir a few times till well mixed, and then add the potatoes and the green chillies.
Turn around over high heat, till they look slightly fried.
Add about 2 cups of water and bring the mixture to a boil.
Reduce flame and simmer uncovered for about 15 minutes.
Beat the yoghurt till smooth and add to the potatoes.
Serve hot, garnished with the chopped coriander leaves.
Key Ingredients: rock salt, potatoes, tomato, salt, red chilli, green chillies, clarified butter, asafoetida, coriander powder, cumin seeds, ginger, garam masala, tomatoes, turmeric, coriander leaves, yogurt