Wash and put the potatoes in a cooker to boil After they cool down peel the potatoes and break them into fat pieces.
Pour oil in a frying pan(kadhai) and heat, put Heeng and Jeera in hot oil. On ce Jeera is roasted add turmeric powder, coriander powder and gram flour. Gently stir fry these ingredients. Put potatoes and red chilly powder in the pan stir fry for another 2-3 minutes till potatoes are coated with spices all over. Pour 2-3 cups of water, cover the pan and cook the curry till it comes to boil.
Take out curd from the fridge 30 minutes earlier then beat it.
Pour curd in the boiling curry with one hand while you stir curry continuously with the other till it comes to boil. Stop stirring, add salt to the curry and allow it to boil for 2-3 minutes.
Aloo Rasa is ready, mix green coriander in Aloo Rasa. Pour out the curry in a bowl and serve with chapati, paratha or puri.