Bring the water and sugar to the boil in a small saucepan and cook until it reaches approx. 135°C.*It is important that it has turned into a thick syrup – so do not take the pan off the heat before then.
Turn off the heat, tip the chopped white chocolate into the syrup and whisk immediately with a hand mixer.In no time the chocolate will come together with the syrup into small, firm crystals.
Tip the crystallised white chocolate out onto a sheet of baking paper and leave it to cool completely. Store the crystallised chocolate in an airtight container.