Now make the cover.The cover has to be made a bit carefully. Place 1 cup water in a pan and boil it. Once it boils add salt and oil to it . Lower the heat, gradually add the rice flour with one hand and stir the mixture continuously with the other till all the flour is incorporated.Take care that no lumps are formed in the mixture. Take it off the heat, cover and keep for 1-2 minutes. Remove the dough on a flat surface and knead well with your hands while it is still hot. You can apply a little oil to your hands to avoid the dough from sticking.