In a large bowl mash 2 ripe bananas, add 3 tbsp curd, 2 tbsp sugar, ½ tsp cumin seeds and mix well
Add ½ tsp salt, ¼ tsp baking soda and mix well. Gradually add 2 cup maida/ all-purpose flour to the bowl and knead it into a dough
Increase the amount of flour if necessary to create a smooth dough that doesn't entirely stick to your fingertips
Avoid adding any water while you knead the dough. When sugar, banana, and curd are combined, it releases enough water to knead dough
Cover the dough thoroughly with a moist cloth, squeeze out all the extra water, and let it sit at room temperature for 7-8 hours
Lightly knead the dough before shaping it into buns. Create tiny dough balls the size of lemons and lightly dust with flour before rolling it out. Keep the balls thick and don't overly flatten them
Heat the oil for deep frying; dip a little piece of dough into the oil to see if it is hot enough
Drop the buns individually into oil and fry on a medium flame. The pooris puff up beautifully as soon as you place them in the oil; turn them over and hold them under the oil for a short period of time to encourage further puffing
Take the poori out of the hot oil once it is golden brown on all sides and lay it in a bowl lined with paper towels
Serve these delicious, soft, fluffy buns on their own or with sambar or coconut chutney