Make a classic Christmas cocktail with gin, triple sec, lemon and egg white. It's light and refreshing, but has the strength of a martini – enjoy responsibly!
Tip the gin, triple sec, lemon juice, sugar syrup, egg white (if using) and ice into a cocktail shaker. Shake until the outside of the shaker feels very cold, then strain the mixture. Discard the ice, then return the drink to the shaker and shake again until the egg white is frothy.
Pour into a coupe glass and garnish with a twist of lemon zest to serve.