using eno helps to get soft idli. the batter should be neither too thick nor thin but medium and smooth. adjust the batter by adding curd and water. do not make the batter too watery or runny as idlis might break. curd and eno are the key ingredients to make soft and fluffy idlis. an alternative to the curd, buttermilk can also be added. add eno to the batter just before steaming idlis and not on beforehand and mix until it turns frothy and then steam idlis. else they will not turn fluffy. steam the idlis on a medium flame to get soft idlis. do not keep the flame on high.