Juice the lemons until you have 1/2 cup (120 ml) of fresh juice.

Slice additional lemons for garnish.

Fill serving glasses with ice cubes.

In a large pitcher, combine cranberry juice, lemon juice, and sugar.

Stir thoroughly until the sugar is fully dissolved. Taste and adjust sweetness if needed.

Slowly pour in the chilled sparkling water, stirring gently to preserve the fizz.

Pour over ice-filled glasses.

Garnish with lemon slices and fresh cranberries.

Serve immediately and enjoy the sparkle.