The original liqueur formulated by Brother Antoine from the 'elixir' (Chartreuse Elixir Végétal). Green Chartreuse is flavoured with extracts from 132...
Chartreuse definitely is a nice addition to any bar! If you see both verte and jaune (or cheaper alternatives), I would skip the yellow one though as imho it just adds a taste of honey and isn't worth the price. Which by now is almost the same in Germany as it is in America, so I might need to look for alternatives pretty soon too 💀