Add the ragi flour, beaten egg yolk and applesauce in the bowl. Mix well.
Add water as required to get a lump free batter. The batter should be of pouring consistency, but not runny. Keep aside for 10 minutes.
Melt butter in a frying pan.
Add a ladle-full of batter in the center of the pan. Do not spread the batter with a spoon. Let it spread by itself.
Cover the pancake and cook on a low flame for a minute or so, till small bubbles appear on the surface of the pancake.
Flip the pancake and cook on the other side as well. Take off the flame.
Make more pancakes with remaining batter. Serve warm.