To a pressure cooker, add oil. Once the oil heats up, add cumin seeds and let them splutter.
Now add thinly sliced onion, turmeric powder and saute until onions turn translucent.
Next, add the chopped tomatoes and saute until they turn soft but not mushy.
Once this is done, add the freshly prepared masala powder and give a good mix. I would suggest you to not add the complete batch of the powder prepared at once, wait until you add water to check the taste.
Now add the washed rice and mix well. Add water, salt, and chopped coriander leaves.
Check for the salt and spice level. If you think you can handle more spice, add the remaining powder and salt if required.
Bring this mixture to a boil, close the lid of the pressure cooker and cook up to 2 whistles. Let the pressure release on its own.
Garnish with more coriander leaves, if you wish to and serve with chilled onion-tomato raitha.