Soak jowar for half an hour and rinse well in running water.
Blend in the grinder with a little water, till the consistency is like idli batter.
Mix the dosa batter and the jowar batter with the chopped onions and coriander.
Heat the appe or kuzhipaniyram mould. Add a drop of oil to each of the mould.
Once hot, pour a ladle of batter into each mould, taking care that you fill only 3/4 th of the mould as the batter will rise a little.
Once you see small bubbles appearing on the surface and a light golden brown color on the lower portion of the balls, flip them over and cook till the other side is the same light golden brown.
Unmould the balls and serve with a chutney of your choice.