Juice Limes: Cut the limes in half and squeeze them to obtain about 1 cup of fresh lime juice.

Prepare Jalapeños: Halve and finely dice the jalapeños, removing seeds for a milder flavor.

Cook Limeade Base: In a medium saucepan, combine lime juice, diced jalapeños, and sugar over medium heat for about 5 minutes.

Strain Mixture: Pour the cooled mixture through a fine mesh sieve into a large pitcher.

Combine with Sparkling Water: Add 4 cups of sparkling water to the strained liquid in the pitcher.

Serve: Fill glasses with ice cubes, then pour the sparkling limeade over the ice.