Place sugar into Thermomix bowl and mill 10 sec/speed 10.
Add eggs, vanilla to Thermo bowl and mix 10 sec/speed 6.
Add roasted nuts, flour, baking powder, Brew Choc and salt. Knead 2 min/Interval/dough setting.
Turn out onto tray and with wet hands, shape into large flat rectangle. Bake 25 minutes until golden. You can use a Baguette tray to keep the size of the biscotti from spreading sideways if you wish.
Cool and slice into biscotti, return to the oven and cook a further 15 minutes or until golden brown and completely crispy. Allow to cool before coating one end with melted chocolate.