Like most quality absinthes, Pernod Fils was produced by macerating herbs, including wormwood, fennel, melissa and anise in a neutral spirit of agricultural origin (usually wine) in a copper alembic where the mixture was then distilled, to produce a transparent liquor. Part of the distillate was then steeped with additional herbs, such as hyssop and petite wormwood, to produce a green-colored fraction that was then filtered and reunited with the main part. The coloration process was done primarily to impart additional flavor and aroma to the absinthe, but the ensuing light olive tint also had the added benefit of enhancing its visual appeal. The colored distillate was then reduced in strength, with the 68% ABV product representing the most popular version of the brand. The predominant flavor in Pernod Fils, like all absinthes, was primarily anise - a flavor commonly misidentified by anglophones as "licorice".
Despite the ravages of the French ban and the subsequent First World War, Pernod Fils' absinthe did not completely disappear. Production was resumed on a smaller scale at the Banus distillery in Tarragona, Spain, where absinthe had never been formally banned. However, the drink never regained its former popularity, and by the 1960s, production of Pernod's absinthe was ceased. Concurrently in France, the Pernod company began producing a liqueur d'anise (anise liqueur) in the years that followed the First World War, and it is this product which has evolved over the decades into its familiar present-day incarnation. Modern day Pernod liqueur d'anise is altogether different than its predecessor, being compounded from a modern, industrial process, being significantly lower proof (45% ABV vs 68% ABV) with a much different flavor profile, and bottled with artificial dye and sugar.