01 - In a small saucepan, combine water, granulated sugar, and sage leaves. Simmer gently, stirring until sugar dissolves and the mixture becomes aromatic. Remove from heat and allow to steep for 10 minutes, then strain and cool completely.
02 - Pour fresh lemon juice, orange juice, and cooled sage syrup into a pitcher. Stir thoroughly to blend flavors.
03 - Fill four glasses with ice cubes. Divide the citrus mixture evenly among the prepared glasses.
04 - Top each glass with chilled sparkling water and stir gently to incorporate.
05 - Finish each glass with a fresh sage leaf and an optional citrus slice. Present immediately for optimal freshness.