Soak the fruits with the orange zest, juice and liqueur for 2 hours
Line a 1.5 litre (2� pint) pudding basin with cling film
Whisk the cream, vanilla and icing sugar until soft peaks form. Fold in the fruits and spoon into the basin. Cover and freeze
Put the chocolate, butter and 3 tablespoons of water in a bowl over a pan of barely simmering water, stirring occasionally, until melted and smooth. Leave to cool
Line a plate with non-stick baking paper. Carefully dip the pudding basin into a bowl of warm water and unmould onto the plate. Remove the cling film and pour the chocolate over to cover. Freeze uncovered, then wrap in cling film and foil and return to the freezer until needed
Remove from the freezer 25 minutes before serving