In a mortal-pestal, add green chilli, ginger, garlic, curry leaves, and some coriander leaves. Crush it into a coarse paste. Keep it aside.
In a mixing bowl, mash boiled potatoes and keep them aside.
Now in a pan, add oil, mustard seeds, cumin seeds, and hing. Sauté for a minute.
Then add the coarse paste. Sauté for a minute.
Now, lower the flame and add turmeric powder, coriander powder, garam masala, and salt. mix well.
Switch off the gas and add the tempering to the boiled potatoes.
Also some coriander leaves and lemon juice. mix well.
Aloo masala is ready.
Make a round shape ball from the masala and keep it aside.