Heat oil in a kadhai.
Add cumin seeds, let crackle.
Add the unpeeled, cubed potatoes.
Add salt and sauté.
Simmer, cover and cook till the potatoes are done.
Check-in between and stir carefully so that the potato cubes are intact.
If required sprinkle some water.
Once done sprinkle turmeric powder, coriander powder, chilly powder and mango powder.
Sauté on a full flame to mix in the spices.
In a bowl, stir together the minced garlic and warm water. Sprinkle over the potatoes.
Serve hot.