In a container (best to use an earthen ware bowl), combine medium grain rice, glutinous rice and water. Soak the mixture for 2 days.
Drain the rice reserving the liquid, place rice in food processor or blender then blend in high speed while slowly adding water a teaspoon at a time. Continue to blend and add water until the consistency resembles pancake batter. Once texture is smooth place mixture back to the container then cover with glad-wrap. Place small holes on the glad wrap by pricking it with toothpicks, this will let the mixture breathe during the fermentation process. Place in a warm place then let it ferment for 3-4 days.
After 3 or 4 days the consistency of the mixture would be thicker, gently fold sugar into the mixture.
Pour into greased mould then steam for 15-20 minutes.
Remove from moulds then serve.