French Dew Sour

Use 2:1 rich simple syrup for its listed portion.

Pre-chill an Old Fashioned glass to enhance the cocktail's presentation and flavor.

Prepare a garnish of lemon slice and rosemary, setting them aside for later use.

Combine the cognac, Bénédictine D.O.M. liqueur, freshly squeezed lemon juice, rich sugar syrup, your choice of egg white or alternative, Angostura Aromatic Bitters, and vanilla extract in a shaker.

Add ice to the shaker and shake vigorously to chill the mixture.

Strain the mixture back into the shaker, discarding the ice.

Dry shake without ice to create a smooth, frothy texture.

Fine strain the cocktail into the pre-chilled Old Fashioned glass filled with fresh ice.

Garnish with the prepared lemon slice and rosemary sprig for a fragrant finish.