Élixir Végétal de la Grande-Chartreuse was first made by the Chartreuse Monks in 1737 using a wide array of aromatic ingredients. Bottled at 69% ABV, it's a rather robust, powerful liqueur which can be served diluted in sugared water, or (rather interestingly) by dripping a few drops on a sugar cube.

The stuff!!! Keeps me flying all night. Just love it. CM