Wash and pressure cook the potatoes, once the pressure falls, peel the out skin, cube it and keep it aside.
Take all spice powders and ginger paste, mix them with water, and keep it aside.
Heat a nonstick pan with oil, and splutter mustard in it. Add the spice water and bring it to a boil.
Next, crumble the boiled potatoes and add to the pan, smash well, and mix.
Add salt and water as required for the gravy.
Simmer for 10 mins and check if the gravy is done, it is usually done in 10mins.
Garnish with chopped coriander leaves
Serve with kachoris.