Pistachio Wafers with Marmalade Semifreddo

• 3 oranges
• 75 g (2½ oz/⅓ cup)

Grate the skin of two oranges and squeeze all three oranges. Bring the juice with half of the sugar and vanilla sugar to a boil and cook for at least 10 minutes until reduced by one quarter. Stir in the marmalade and leave to cool. Bring the cream, the crème fraîche, orange zest and reserved sugar to a boil and lower the heat. Stir until the sugar has dissolved. Beat the egg yolks in a bowl. Po