In a saucepan, add water, salt and oil. Bring to a boil.
Heat a pan over medium-low flame.
Add rice flour. Lightly roast the flour but avoid browning it. Turn the flame off.
Slowly pour the water into the saucepan. Mix well.
Stirring continuously with a spatula. The dough should form a ball and be slightly sticky.
Cover and keep it aside for 10 minutes.
Knead the warm dough for about 5 minutes until it becomes smooth and pliable.
Grease the idiyappam/sevai maker and idli mould with oil.
Shape the dough into a cylindrical shape and place it in the maker.
Directly press it over the greased idli mould in a concentric circle.
Steam the idiappam for about 10-12 minutes or until it is cooked and fluffy.
Let it cool slightly. Then take it out.
Serve hot with chutney or chicken stew!