One 12-ounce can San Pellegrino Limonata (or 1/2 cup lemonade concentrate, thawed, plus 1/4 cup seltzer)
2 teaspoons Maraschino cherry juice
Maraschino cherries, for garnish
Pour the whiskey, half of the Limonata (or all of the lemonade concentrate and seltzer), and the Maraschino cherry juice into a cocktail shaker with crushed ice.
Shake well to combine, and divide the mixture between two highball glasses.
Add the remaining Limonata and garnish with a Maraschino cherry.