Mix together cubed chestnut, sugar and beetroot powder and let it infuse for 30 minutes.
In a deep tray, spread the tapioca starch out. Drain the chestnut and coat it lightly with the tapioca starch.
Bring a pan of water to boil and lower the heat until simmering point.
Drop the coated chestnut and simmer until it floats.
Ready an ice bath. Remove the chestnut and shock it in the cold water. Reserve until ready to serve.