Soak the rice in water for 2 days, then put it in a sieve and let it drain. Then blend into a fine paste in a high-performance blender. Mix the rice paste with the sugar, vanilla and coconut. Thick bamboo tubes: Pour the seasoned rice porridge lightly into the bamboo tubes, do not press, just pour in lightly, if necessary cover the ends with perforated foil. Then cook in the combi steamer at 99°C in steam mode, 60% fan speed for 10-15 minutes, depending on the thickness of the bamboo tubes. Serve the purple rice cake on a banana leaf and garnish with topping.