Whisk together the icing sugar, egg white and spirit vinegar to make a thick, fairly stiff paste, ideally using an electric whisk. Colour part of the icing mixture with black food colouring. Cover the pears with the white icing. Place on a wire rack until set. Put the black icing into a plastic piping bag. Cut the smallest hole possible in the bag and pipe eyes onto the pears. The ghosts are ready. The leftover black icing can piped into spider shapes to decorate your table.
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