Prick boiled potatoes with a fork and roast them on low to medium flame. Keep it aside. (refer to video).
Now in a mortal-pestal, add green chilli, garlic cloves, cumin seeds and salt. crush it into a coarse paste.
Then add peanuts into mortal-pestal and crush it slightly. Keep it aside.
Now in a pan, add oil, mustard seeds, cumin seeds, hing, and curry leaves and saute it.
Then add the chilli-garlic paste and saute it.
Now add chopped onion and saute it till it is translucent.
Then add turmeric powder and mix well.
Now add methi leaves and saute till it becomes slightly soft.
Then add crushed peanuts and mix well.
Now crushed roasted potatoes by hand, also add salt and mix well.
Cover and cook for 5-7 minutes, so masala flavour absorb in it.
Switch off the gas, and add lemon juice and some coriander leaves. Mix well.
Aloo bharta is ready.