Soak the millets, methi seeds and urad dhal overnight.
Soak the dhals separately overnight.
Grind the millets to a smooth batter.
Add the dhals and cooked rice and grind until slightly coarse batter is done.
Add all the batters and salt.
Add chopped coriander leaves, cumin seeds, onion, coconut and mix well.
Heat a pan with oil.
Once hot, drop small ladle full of batter into oil.
Fry until all the sides are brown.
Drain oil and transfer the vadas to plate.
Serve hot with coffee or tea.