Steps
1. Soak rice flour overnight, then steam in muslin cloth. Add sugar and some water to dissolve sugar.
2. Cover with wet cloth for 1-2 hours. Form pingpong-size balls of the mixture; press and flatten the balls.
3. More water or yoghurt can be added while forming the balls. Spread a few sesame seeds on one side of each ball.
4. Flatten into patties and drop in hot oil for frying. The side with sesame seeds should remain on top.

Source
International Rice Institute (IRRI) & International Women's Organization (SUHAY), VIRMANI, Inderjeet (ED)(1991), Home Chefs of the World - Rice and Rice-based Recipes, ISBN 971-22-0023-X, Manila, Philippines