In a bowl add sugar, salt and soda to mashed bananas. Mix well. Add maida and mix to make dough. The amount of flour specified is approximate, add enough flour to make a stiff dough. Cover this dough and leave for about 3-4 hours. Maximum resting time of this dough is 8 hours, this make the dough to raise in its volume. Shape into balls with wet hands. Drop the balls into hot oil and fry them brown. Serve hot.