Heat oil in a non-stick pan, add cumin seeds, green chillies and sauté till fragrant.
Roughly chop tomatoes and grind into a purée. Add puree to the pan and cook for 3-4 minutes.
Add red chilli powder, coriander powder, turmeric powder, dried mango powder and sauté for 2 minutes. Add bhuna masala and mix.
Add potatoes and mash as you mix. Add 5 cups water, salt and mix well.
Add pressed rice and mix. Add lemon juice, coriander leaves and mix well. Cook for 3-4 minutes.
Transfer into a serving bowl and serve hot.