Sparkling Cucumber-Basil Limeade
1 cup sugar 1 tablespoon lime zest, plus 1 cup fresh lime juice (4 to 6 limes) 1/4 cup fresh basil leaves, lightly packed 1 medium English cucumber, halved and thinly sliced 2 cups chilled sparkling water In a small saucepan, bring the sugar, lime zest + 1 cup water to a simmer over medium …