Heat oil in a cooking vessel, add mustard seeds and let them splutter.
Add the cumin seeds, green gram lentils and curry leaves and sauté till nice aroma emanates.
Add the sliced onions, green chillies and ginger and sauté for 2 minutes.
Add salt and water and bring to a boil.
Now reduce the heat and slowly add the rice rava to the water and mix continuously so that it combines well with the water.
Cover it with lid and let it cook for 10 minutes.
Turn off flame and transfer to a serving bowl.
Serve hot with chutney or pickle.