Chocolate Yogo

20-40 g cocoa (depending on how rich the cocoa is)
40g cornflour
120g sugar
800ml milk
Sift dry ingredients and mix with 300mls of the milk. Heat remaining 500mls milk in saucepan until about to boil. Pour chocolate milk mix in to hot milk and whish briskly until quite thick. Pour in to container, cover with cling film resting on chocolate custard all over so no skin forms on top, and put in fridge overnight to set. Alternatively, put all ingredients in thermomix, cook 90 deg on speed 4 for 9 minutes, then put in container and refrigerate as above.