1½ oz vodka½ oz ml lemon juice⅓ oz simple syrup (1:1)2½ oz ginger beer2 drops vanilla extract
instructions :

Pour all ingredients in a highball glass with ice cubes.

La recette initiale prévoit 10 ml de vanilla syrup.

Vanilla syrup :

make a sugar syrup (50/50 sugar/water) and scrape the seeds of a fresh vanilla bean into the syrup and let the whole bean sit in the syrup over night.

source :