Heat the oil and add in your cumin seeds, nigella seeds, and curry leaves.
When it gets spluttery and aromatic add your onions and green chillies and saute on until the onion starts to brown at the edges.
Then add the rest of your spices and stir fry until they darken slightly, if they stick to the bottom of the pan add a splash of water.
Then add your tomatoes and cooked till the 'wetness' sautes out and you're life with a rich paste with the oil rising above it - in Urdu we call this Bhunna
Add your potatoes and saute for a minute or two.
Now add your rice, and then add just enough water that you have approximately half an inch of water rising above your rice. Now some brands cook quicker than others so please adjust the water accordingly. In a pinch you can add more, but taking water away – that’s not so doable.
Bring the water to a boil, and cook on medium till the water level drops to that off the rice, then simmer on low heat to tender fluffy perfection. Again if your brand of rice cooks quickly then please start with less water and watch your cooking times!
Top with a little lemon juice and sliced green chilies and serve hot with raita and kachumbar