Shrub cocktails get their tart pucker from vinegar.
Makes 8 servings
1 1/2 cups loosely packed fresh mint leaves
1/3 cup superfine sugar
1/2 cup elderflower liqueur
1/3 cup Champagne vinegar
1/4 cup fresh lemon juice
3 1/2 tablespoons fresh lime juice
Chilled sparkling wine
Garnish: fresh mint leaves
Muddle first 2 ingredients in a cocktail shaker to release flavors; add elderflower liqueur and next 3 ingredients. Fill shaker with ice; cover with lid, and shake vigorously until thoroughly chilled (about 30 seconds). Strain into 8 (8-oz.) glasses; top with sparkling wine.