Produced by the Carthusian Fathers (monks), the Chartreuse recipe dates back to 1605. The recipe remains a closely-guarded secret; only three of the brothers know the names of the 130 plants and how to blend and distill them. They are also the only ones who know which plants must be macerated to produce the distinctive color. They alone supervise the slow aging in oak casks over several years.
The monks maintain a simple, prayer-filled life in their ancient monastery. As they have done for centuries, they appoint three brothers who are charged with producing the Chartreuse and keeping the recipe secret, until it is time to pass it on to other brothers.