Traditionally made with equal parts gin, Green Chartreuse, maraschino liqueur, and lime juice but, like like many others, (when using a 40%-43% alc./vol...
A cheaper alternative to Chartreuse is Boomsma Claerkampster Cloosterbitter - it has 17 herbs instead of Chartreuse's 130, and it's noticeably less complex, but overall tastes quite similar.