Place Dr. Oetker Nona Rice Flour, Plain Flour and Instant Yeast in a large bowl, mix well.
Blend rice and water. Add in brown sugar and coarse sugar, blend well.
Pour rice mixture into the flour mix. Mix well and rest for 2 hours.
Divide mixture into 4 bowls. Add different colour to separate bowls, mix well.
Bring water to boil and wrap the cover with a clean cloth.
Grease the mould. Fill with rice cake mixture and steam with high heat for 20 minutes.
Set rice cake aside to cool before removing from the mould.