L'amour En Fuite

Pour the absinthe into an Old Fashioned glass filled with ice, then top with water and let it stand.

In a separate mixing glass, stir the gin, dry vermouth, and elderflower liqueur with ice until well chilled.

Discard the contents of the Old Fashioned glass, keeping only the absinthe coating. Strain the mixed cocktail into this absinthe-coated glass, ensuring no ice is included.