The white lady was made in honor of Eveline Alice Wander Gorkiewicz, who helped British prisoners of war escape Turkey in the first world war. She would dress up as an old Turkish wash lady (dressed in white) and hide the prisoners in the washing trolley. The drink was named by the soldiers she rescued.
Half-fill a cocktail shaker with ice.
Add all ingredients and shake until well-chilled.
Strain into a chilled cocktail glass.