Begin by ensuring all beverages—lemonade, pineapple juice, Sprite—are well chilled. This minimizes the need for ice, keeping your punch flavor intact. Slice the lemon into thin rounds; fresh slices not only look great but add a tangy aroma that elevates the drink.
Pour the lemonade and pineapple juice into your pitcher or punch bowl, stirring gently to marry their flavors. Slowly pour in the Sprite to preserve its effervescence, giving a light stir so the fizz remains lively and refreshing.
Drop in the lemon slices and pineapple chunks, stirring gently to distribute. If desired, garnish with fresh mint sprigs tucked among the fruit. Refrigerate the punch for up to 1 hour before serving—or serve immediately over ice if you're ready to enjoy right away.
Serve the punch in glasses, ensuring each gets some garnishing fruit and perhaps a mint sprig. The flavors meld wonderfully as it sits, so you may notice even brighter notes after chilling.