In a bowl, add the rice flour, wheat starch and 1/2 cup water. Mix until well blended.
In a small pot, add the remaining 1/2 cup water with the dark brown sugar. Whisk until the sugar is completely dissolved. (You may turn off the fire once water is hot or let it come to a slight boil)
Add both mixtures (from steps 1 and 2) together and mix until combined.
Bring some water in a steamer pot to a boil.
Lightly coat 6 earthen bowls with some oil, then steam them while empty for about 5 minutes.
Place 1.5 tsp of cooked red beans into each bowl. Subsequently, divide the batter between the bowls equally and steam for 15-20 minutes, or until an inserted toothpick comes out clean. See Note 1
Remove the cakes from the steamer pot and allow them to cool.
Serve at room temperature and enjoy! See Note 2.