For a festive whisky cocktail, throw together this traditional Christmas snowball.
Mix together the lime juice and zest and caster sugar in a small bowl. See aside for an hour before using.
To make the cocktail, place the egg, whisky and one tablespoon of the lime mixture into a cocktail shaker. Top up with ice cubes and shake well. Strain into a a highball glass and top up with ginger ale.
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