The tangy flavor of seasonal rhubarb complements the taste of gin surprisingly well. You can double the quantities for a bigger batch.
Cooks' Note
Cooks' notes:
Rhubarb syrup (without lime juice, gin, or Cointreau) can be made 1 day ahead and chilled, covered, or frozen 1 week.
Lime juice, gin, and Cointreau can be stirred into rhubarb syrup 4 hours ahead and chilled, covered.