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Soak Urad Dal and Health Sutra Multimillet Idly Rawa separately (for 1 cup Urad Dal, you need 3 cups Multimillet Idly Rawa)
Grind the Urad Dal after 3 hours of soaking and add the soaked Multimillet Idly Rawa.
Add sufficient water and ferment the batter overnight.
Add salt for taste.
Multimillet idly batter is ready!