Place the pineapple chunks and fresh pineapple sage leaves in a cocktail shaker and muddle with a cocktail muddler until the leaves are broken up and have released their herbal essence.
Pour the pineapple juice and blackberry syrup into the cocktail shaker along with about 4 large ice cubes. Cover and shake until well chilled.
Remove the lid from the cocktail shaker and strain into a champagne flute until it is halfway full.
Top the champagne flute off with champagne of choice.
Garnish with pineapple sage leaves and flowers.
Makes 2 servings.
How To Make Blackberry Syrup
Put all of the ingredients into a small saucepan and slowly bring to a boil.
Occasionally mash the berries against the inside of the pot. Boil for about 8 minutes or until the syrup slightly thickens.
Remove the saucepot from the heat and allow to come to room temperature.
Once cool strain through a coffee filter or piece of damp cheesecloth.
Place syrup in a jar or container with a lid. Refrigerate until ready to use.