Put the Potato and Tapioca in water, Add turmeric powder and let it cook until 3/4th done. strain it and discard the water
grate the potato and tapioca
to this, add green chilli, onion chopped, salt, turmeric powder, chilli powder, Rice flour, maida, Mix well and make tight dough
Apply oil over hands, make thin flat round vadas out of the dough.
Put them in hot oil and fry until its golden brown on both sides. strain on paper towel and serve hot