Peel and cube the potatoes into small bite sized peices, for easier cooking.
Heat oil in a saucepan. Fry the nigella seeds for a minute.
Add in all the ingredients into the pan with a little bit of water, and give a good toss.
Cover and cook on low flame, stirring occassionally till the potatoes get completely cooked. Sprinkle in water if it sticks to the bottom of the pan.
Serve warm with pooris or parathas.