THIS!
Cioccolata Densa
9g cocoa
34g sugar
5g cornflour
20mL water
170mL milk
Mix sugar and cocoa together (If possible use Italian bitter cocoa.)
Dissolve the cornflour in the water by stirring, then mix it with the
sugar/cocoa to form a brown goo.
Heat the goo in a saucepan over a low-medium heat, always stirring
with a whisk. Slowly add the milk to the mixture, and keep stirring.
Bring the mix to a simmer and keep stirring, but slow it down a bit so
you're only stirring occasionally.
Once it's a thick, glossy molten liquid you're ready! It'll look like a
thick chocolate pudding that's not quite set. Pour it into cups, grab a
spoon and dig in.