Roast the cacao nibs on a flat lined tray, in a cold oven set to 150°C for 15 minutes.
Place the still hot nibs into the Thermomix bowl and blend 10 min/50°C/speed 6.
Add the sugar, cocoa butter and vanilla bean paste and blend 5 min/speed 10. Allow to cool in the bowl.
Once the chocolate has cooled sufficiently, (registering around 40°C on the Thermomix) stir 5 min/speed 0.5.
Pour into a mould and allow to set at room temperature.
If you are adding flavours or fruit and nuts, add them in step 4.