Chartreuse is the most storied liqueur in the world. Produced since 1737, the exact blend and composition of its 130 ingredients is a closely guarded secret held only by a handful of Carthusian monks, who have taken a vow of silence as part of their life of contemplation and prayer. Both green and yellow bottlings are composed of the same ingredients, but with differing levels of proof and intensity following several macerations and distillations.