first prepare the yeast mixture. mix together some little warm water and add yeast and sugar then mix well and keep it for 10 minutes. now mix rice flour and undu flour in a large bowl and add the yeast mixture and mix well together all. then add a little water and mix againand let the mixture rise 3 hours. after 3 hours add salt and mix again. now heat a flat nonstick pan and spread a little oil using a paper towel. then add a large spoonful of mixture at a time and cook them until well done.