5 issues of BBC Good Food for £5
Put 1 martini glass in the fridge to chill. Mix the white caster sugar with the finely grated zest of the lemon, and set aside.
Pour the vodka into a cocktail shaker and add the triple sec, lemon juice and a handful of ice. Shake really well until the outside of the shaker feels cold.
Dip the rim of the chilled glass in water, shake off the excess then dip into the sugar and lemon zest mix.
Strain the contents of the shaker into your prepared glass and enjoy.