Peel and mash the banana with a fork or a masher till it becomes into a smooth paste.
Add yogurt, sugar and salt to it. Mix well.
Sift flour with soda bicarbonate into another bowl.
Add cumin seeds and mix.
Add the banana mixture to the flour.
Mix and form a rough ball.
Rub your hands with ghee and knead the dough till it becomes smooth.
Cover the bowl with a lid or the dough with a damp cloth.
Let it rest for 4-5 hours.
Heat enough oil in a work, kadai or a deep pan for frying over medium heat.
Divide the dough into 10-12 parts.
Roll each dough into a ball.
Using a rolling pin, roll out one part into a circle about 4 - 5 inches in diameter. Should be a little thick and not thin.
Check to see if the oil is ready. Drop a very tiny piece of the dough into the oil. It should sizzle and come up immediately.
Fry the rolled puri in the oil over low to medium heat till its golden brown on both sides.
Repeat steps 13 and 15 till you've rolled and fried all the pieces of dough.
Serve immediately with some tea, coffee or a curry. We enjoyed some with a curry and the leftovers next day with some tea.