Place 2
cups (500ml / 16 fl oz) milk, 1/4 cup (80g / 2.75 oz) chocolate
hazelnut spread and 50g (1.75 oz) finely chopped dark chocolate in a
pan and heat slowly, without boiling. Stir constantly for 5 minutes,
or until the chocolate has melted. Divide between 2 mugs and top
with whipped cream and roughly chopped hazelnuts.