Crush all ingredients in mortar and peste (or in a plastic bag with a rolling pin if you dont have one) except the Wormwood, Angelica root and Hyssop. Put all ingredients into the bacardi 151 (you will need to put it all into a larger bottle so it fits) and let it sit (still in a cool dark place) for 4-7 days. Strain out into a bottle and enjoy.
Letting it sit for 4 days will do the trick, 7 days will make it slightly more potent but it will be much more bitter. Using a weaker alcohol will work but it will turn brown instead of the usual green colour.