Iced Chocolate Marquise

A chocolate marquise can either be chilled or frozen but I think this luxurious concoction is best as a glorious ice cream. As it is a pudding which can be made well ahead and is extremely impressive (though not difficult) it is ideal for a special dinner party. The frozen marquise is sliced across in thick slices to serve, and if you like accompany it with cream or soured cream to spoon either