Peel and Chop potatoes into 1" cubes. Chop Onions and tomatoes to fine pieces
Heat a pan with Oil. Saute in Onions, fry till they are nice brown in colour.
Next, add tomatoes. add all the powders. Fry on high flame for 2 mins.
Then simmer and add water. Then add the potatoes, bring it boil, then simmer so that the potatoes get cooked. Once they are done, add Cumin and simmer for 5 mins more.
Notes
The sabzi is ready. It has the nice aroma of cumin and when you chew you can feel it.