Mix flour with salt, sugar, coarsely ground pepper, jeera and baking soda.
Add oil and rub into the flour.
Add mashed banana and mix.
Add yogurt ½ cup at first. Then add more little at a time.
Knead it till its smooth. Shape into a ball.
Rub ghee or oil over the dough. Cover and let it ferment for 6-8 hours.
I prefer to allow it to ferment over night.
Heat a tawa or frying pan over medium heat.
Divide the dough into 8 equal parts.
Roll each into a ball and roll it in the flour.
Take one part and roll it out into a circle of 5-6 inches in diameter. Use flour whenever necessary.
Put the rolled roti on the hot tawa or skillet. Let it roast for 2-3 minutes.
Flip it over and roast for 2-3 minutes.
Using a spatula, gently press it down at the edges till brown specks appear and the under side is cooked.
Flip the roti and press down gently with a spatula till its cooked.
Transfer to a serving plate.
Smear ghee over it.
Repeat the above steps with the remaining dough.
Serve vastad roti with your favorite curry or dalithoy.
It tastes equally good with some filter coffee or masala tea as a breakfast option.