Take the flour, salt, baking soda, ghee, sugar and curd in a bowl.
Blitz the banana in a blender to a smooth paste.
Add this to the flour mix.
Apply a bit of ghee in your hand.
Knead the flour mix till you get a slightly sticky dough.
If the dough is too sticky, you may add more flour.
Keep the dough covered with a wet cloth, at room temperature for 3-4 hours. Alternately you could refrigerate overnight.
Take small balls off the dough and roll out to small discs of 3 " diameter.
Heat oil for deep frying.
When the oil is hot, carefully drop each disc and fry till they puff up and turn brown on either side.