Cut the limes in half and squeeze the juice into a jug.
Tear the fresh mint leaves into smaller pieces and add them to the jug.
Pour in the agave syrup and stir well to combine the lime juice, mint leaves, and syrup.
Add a handful of ice cubes to the jug.
Slowly pour the carbonated drink into the jug, stirring gently to mix all the ingredients together.
Taste the drink and adjust the sweetness by adding more agave syrup if desired.
Take a few mint leaves and gently crush them between your fingers to release their aroma. Use them as a garnish for the drink.
Serve in glasses filled with ice cubes and garnish each glass with a sprig of fresh mint.