First wash and soak both rice for 4 hours
Drain the water using colander
Grind the moist rice into powder and sieve it. For the last batch, retain the coarse grits
Cover the rice powder with a towel and steam in a idli pan for 30 minutes
Turn off the heat and let the steamed rice cool until its manageable
Transfer the steam rice to a wide vessel and ensure it is lump free
Prepare salt water (mix salt with water) and sprinkle it over the rice powder. Combine well
Check the consistency; able to hold and shape into kozhukattai but should crumble into granules easily
Steam the mixture again for 20 minutes, covered with a towel
Let it rest for 10 minutes after steaming
Transfer the rice mixture to a wide plate
Add grated coconut, cardamom powder and sugar. Mix everything well
Temper cashew in ghee and them to the puttu mixture
Combine everything throughly and let the mixture cool to room temperature
Keep it covered until ready to serve