Soak the gelatine in cold water. Heat the juice in a small saucepan, dissolve gelatin in it, leave to cool. Beat the egg yolks with icing sugar until a thick foam, add the juice, chill.
Whip the cream. When the cream starts to gel, add the cream. Pour the cream into the chocolate waffle cups and cover and chill for at least 30 minutes.
Sprinkle the mousse with pieces of tangerine and chocolate shavings.