Prick potatoes with a fork and boil in salted water till done.Peel potatoes and keep aside.
In 1/2 tbsp oil fry onion.When onion looks transparent, add chopped ginger and garlic.Fry till raw smell is gone.
Grind together all ingredients mentioned under chutney to a fine paste.
In a pan heat oil,add dry red chilli.Add peeled and cooled potatoes.fry in high heat for 5 minutes until potatoes are slightly golden in color.
Add all spice powders turmeric,coriander,cumin and chilli powder,salt except garam masala.Stir fry for 4-5 minutes.
Add coriander and mint paste.cook until the raw smell goes off.
Add garam masala powder,mix well.Add tomato chunks.
Add tamarind juice,whisked curd.Cook for another 4-5 minutes.
While serving sprinkle sesame seed and chat masala.