Wash and peel the potatoes. Cut into even sized small cubes
To the cut potato, add the chilli powder, turmeric powder, gram flour and salt and mix well. Let it rest for 5 minutes
Heat oil in a pan. Once it is sufficiently hot add the mustard seeds. When they start to splutter add asafoetida and black gram dal and saute for few seconds
Now add the vegtables, mix well , close with a lid and cook in medium flame for 4 minutes. After 4 minutes, take out the lid and continue to cook stirring regularly till it becomes crispy which will take another 4 minutes. Serve warm