Rinse the raw rice thoroughly, then soak in water for 4 hours.
Drain and blend the soaked rice with the cooked rice, yeast, sugar, and 60 ml water until smooth.
Pour the batter into a large bowl. Add coconut milk and salt. Mix well.
Cover and ferment at room temperature for 8–12 hours, or overnight, until the batter is bubbly and slightly risen.
The consistency should be like pancake batter—slightly thick but pourable. Add a bit more water if needed (up to 20 ml).
Heat a small non-stick wok or hopper pan over medium heat. Lightly grease with oil.
Pour in about 80 ml (1/3 cup) of batter. Quickly swirl the pan to coat the sides thinly, letting the rest pool in the center.
Cover with a lid and steam-cook for 2–3 minutes, until the edges are crisp and the center is just set.
Gently remove and serve warm. Repeat for remaining batter.