Break the chocolate into small pieces and melt in a bain-marie. Squeeze the clementine, add the juice to the chocolate and set aside to cool.
Separate the egg into two bowls. Beat the white until soft peaks form. Beat the yolk with the sugar to a pale cream.
the double cream.
Add the cooled melted chocolate to the yolk and sugar and mix well to combine. Fold the white into the mixture and then the whipped cream.
Pour the mousse into two tea cups and chill for two hours or overnight.
Serve dusted with cocoa powder and decorated with citrus peel.
Notes from the cook
An elegant, impressive dessert that it is stunningly simple to make and can be prepared in advance.
Dark chocolate is one of the best-known aphrodisiacs making it the perfect choice for Valentine’s! Find more ideas for a romantic Valentine's Night supper here.