To Prep
Add flour, salt, and sugar in the mixing bowl of a food mixer.
Pour ¼ cup of ghee into the mix and start mixing with a dough hook on low speed until dough clumps.
Add egg, water and condensed milk into the mixer, and keep kneading until the dough is soft and elastic, about 5 mins.
Cut the dough into 6-8 equal size pieces, about 100g each, then roll into balls.
Coat each ball with a teaspoon of ghee, and then place them in one single layer in a large mixing bowl, plate or baking tray. Cover with cling film and allow to rest at room temperature for at least 2 hrs or overnight.
To Cook
Prepare a workspace by oiling a substantial area with extra ghee. Take the dough, one at a time, and place on the bench. Flatten it with your palm and stretch the centre outwards until it is around 0.5 cm thickness.
If you choose to use the traditional stretching method, grab one edge of the dough, lift it up in a swift motion and quickly slap it back on the bench.
Keep doing it in a clockwise direction and the dough will start stretching as thin as paper. If you are not confident with the traditional method, alternatively you can just keep pushing the dough outwards with the palm of your hand in all directions. Eventually, it will become paper thin. It is okay to have a few tears here and there on the dough, as it will be folded later on.
Once the dough is paper thin and almost see-through, fold four corners inwards to make a large square. Lightly grease a large fry pan with ghee then heat it over low heat. Add the roti, and swirl it around to stop it from sticking to the pan.
Cook for about 1-2 mins, then place half of the sliced bananas in to the centre and then fold in the sides of the pastry over the banana to form a parcel.
Add another teaspoon of ghee to the pan and continue cooking the roti for about 2-3 mins then flip over and cook for another 2-3 mins.
Once both sides are golden brown, transfer the banana roti to a plate and repeat with the remaining dough. Cut the banana roti into squares and serve with condensed milk and white sugar.