heat oil and pop in mustard seeds, urad dal, chana dal, curry leaves, red chillies and fry for half a minute
further add finely chopped onions and fry till transparent
add 2 cups water, salt and mix well. let it boil until it comes to rolling boil
slowly add rice flour little at a time while mixing.
mix quickly in simmer until well combined and dough comes out of the pan non sticky,
wait till it is warm enough to handle. grease your hands and make oval shaped dumplings.
place those in the idli pan and steam cook until firm and done. serve hot with red chilli chutney