Pressure cook the pototaoes or microwave till done.

Peel the potatoes and keep aside.

Chop the onions, tomatoes, ginger and garlic and keep aside.

Heat 2 tbsp of oil in a deep pan.

Add onions along with turmeric powder.

Cook until golden on high heat.

Reduce the heat and add the potatoes and tomatoes and cook till a gravy is formed.

Add the sambar/rasam/garam masala powder.

Pour in the tamarind juice and leave the pan on medium heat for 10 minutes. You can cover it with a lid.

In a separate saucepan or shallow bottomed pan, heat the remaining oil.

Add mustard seeds followed by asafoetida, ginger, garlic and the red chilly powder on high heat.

Pour this onto the gravy.

:- Serve hot with chapatti or rice !!