In a large pitcher, pour in the entire 750 mL bottle of sparkling rosé wine along with 20 fl oz of cranberry juice and 12 fl oz of your chosen spirit, either gin or vodka. Stir the mixture gently for about 30 seconds until well blended.

If you desire a touch of sweetness, slowly add the optional 4 fl oz of simple syrup, mixing thoroughly to combine. Taste the cocktail mix after each addition to ensure it aligns with your preferred sweetness level.

To enhance the visual appeal of your cocktail, prepare festive ice cubes. Fill ice cube trays with water and drop in cranberries and sprigs of rosemary. Freeze for at least 3-4 hours or until solid.

When ready to serve, fill glasses with the festive ice cubes and pour the cocktail mixture over them, ensuring even distribution.