In a khadai, season mustard, urad dhal, channa dhal, curry leaves and ginger. Cut onions and green chillies saute them.  For one cup of rava, you will need two cups of  water. Pour the reqd. amount water, add salt and let it boil. Sift the rava into the water and keep stiring.  Keep stiring  until it cooks and comes off seperately. You may add cashews if you like.