Cut the limes in half and squeeze the juice into a medium-sized jug. Use a citrus reamer or juicer for maximum juice extraction.
Tear the fresh mint leaves into smaller pieces to release their flavor and add them to the jug.
Pour in the agave syrup. Stir well to ensure the lime juice, mint leaves, and syrup are combined.
Toss in a generous handful of ice cubes to chill the drink.
Slowly add the carbonated drink while stirring gently. This will mix everything without losing too much fizz.
Take a sip and adjust the sweetness by adding more agave syrup if needed.
Gently crush a few mint leaves between your fingers to release their aroma and use them as a garnish for an extra touch of freshness.
Pour into glasses filled with ice cubes, garnish each with a sprig of mint, and enjoy!