Chop one ripe mango and peel a small piece of fresh ginger. Blend with one tablespoon of water for about 30 seconds until smooth.

Strain the mango-ginger mixture through a fine-mesh sieve into a bowl to extract liquid.

Divide the strained mango-ginger puree evenly among four serving glasses, filling each about halfway.

Fill each glass with ice cubes to the brim.

Pour sparkling water or club soda over the ice in each glass until about three-quarters full.

Garnish each mocktail with fresh mint leaves and serve immediately.