Soak black gram/kala chana over night drain and crush in the blender.
Wash and peel the potatoes and chop it.
Heat oil in a pan.
Add cumin seeds to crackle.
Add chopped onion and fry till light brown.
Add ginger garlic paste,red chilly powder,coriander powder,turmeric powder and 2 tbsp water and saute for two mins.
Add coriander leaves and mix well.
Add potato and crushed black gram and mix well.
Add salt and one cup of water and cover it..
Bring to boil and simmer for ten mins till done.
Add garam masala powder and mix well.
Garnish with coriander leaves and serve.
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