01 - Combine diced mango, grated ginger, lime juice, honey or agave, and 1/2 cup cold water in a blender. Process until completely smooth and no chunks remain.
02 - Pour the blended mixture through a fine mesh sieve into a pitcher or bowl, pressing with a spoon to extract liquid and remove fibrous ginger and mango pulp.
03 - Fill two serving glasses with ice cubes to chill the mocktail.
04 - Divide the strained mango-ginger puree evenly between the glasses, filling each about halfway.
05 - Pour chilled sparkling water into each glass to fill. Gently stir with a spoon to combine the puree and sparkling water.
06 - Decorate with fresh mango slices, lime wedges, or mint sprigs if desired. Serve immediately while cold and effervescent.