Boil Potatoes and peel and keep aside.
Heat oil in a kadai, add the chopped tomatoes and finely chopped ginger. Add salt so that gets mushy and till the oil comes out.
Add all the dry powders. Cook for a few more minutes.
Dice the potatoes into cubes, Add the potatoes and fry for a few minutes. Then add the curd, the kasuri methi and 1 glass water. Cover with lid and cook till its a thick gravy.