Follow these easy steps to prepare your refreshing drink:

1. Muddle Blackberries and Sage: In a bowl, combine the blackberries and sage leaves. Use a muddler or fork to gently mash them together to release their juices and aroma.
2. Create the Base: In a medium saucepan, bring 2 cups of water to a boil. Once boiling, remove from heat and allow it to cool slightly.
3. Combine Mixtures: Pour the boiled water over the muddled blackberries and sage, letting it steep for about 10-15 minutes.
4. Strain the Mixture: Using a fine-mesh strainer or cheesecloth, strain the mixture into a large jar or pitcher, discarding the solid components.
5. Add Sweetness and Citrus: Stir in the simple syrup and freshly squeezed lemon juice until well combined. Adjust sweetness as needed.
6. Cool: Let the mixture chill in the refrigerator for about 15-20 minutes, or until cold.
7. Serve Over Ice: Fill a glass with ice cubes. Pour the chilled blackberry sage mixture over the ice.
8. Add Sparkling Water: For a bubbly effect, top off your drink with sparkling water.
9. Garnish (Optional): Add a few fresh blackberries and a sage leaf for an elegant touch.

These steps will guide you to create a refreshing blackberry sage drink that mirrors the magical flavors of Starbucks.