Sparkling Blackberry Basil Cocktail

Prep time: 10 minutes Cook time: 5 minutes Serves 4-6 Ingredients: 8-10 large fresh or frozen blackberries 3 T. fresh basil, torn ¼ c. honey, preferably local ¼ c. water 4 oz. Elderflower liqueur (optional) 1 750 ml bottle of...