Arrange the ginger cake in the base of a glass dish.
Drizzle over the honey liqueur or sherry. Top with the mandarin oranges and pour over a little of the juice, if you like.
Make up the butterscotch flavour mousse according to packet instructions and spoon on top of the mandarins.
Spoon on dollops of the whipped cream and sprinkle with some demerara sugar, if you like.
Chill until you are ready to serve.
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