Peel the ripe bananas and break them into small chunks.
Add the sugar, water, and banana chunks into the high-speed blender. Blend until well combined.
Slowly add rice flour and sweet rice flour to the banana mixture. Stir gently until the mixture forms a smooth batter about a little thicker than the yogurt consistency.
Pour batter into a steam-friendly medium bowl and steam for 30 minutes on medium-high heat. The steamed mixture should be like a smooth paste.
In the meantime, toast a cup of sweet rice flour in a pan until it turns light brown color. We will use it to dust the prep surface to prevent sticking.
Once the steaming is done, let the mixture cool down for 10 minutes. Then set the mixture onto the dusted surface and knead it for a few minutes until it becomes smooth and no longer sticks to your hands. Add a little more cooked sweet rice flour if it's too sticky.
Divide the dough into two big equal portions and roll each into a thin, flat rectangle.
Roll up each rectangle into a long log shape roll. Cut each log into bite-sized small pieces.
Serve and enjoy!