First, measure out the herbs and spices
Using a mortar and pestle, rolling pin and zip-top bag, or a Blendtec blender, crush the spices
Add the herbs and spices to a dry pan, over medium heat, toast the spices until they are warm and fragrant.
Cool the toasted spices and add ⅓ cup of the spices to a glass canning jar
If making a flavored bitter, add the flavors to the jar.
Cover the spices and flavors with 80 proof alcohol.
Screw on a lid and ring and shake the jar.
Allow the mash to marinade for 2 weeks.
After 2 weeks, drain the infused alcohol away from the mash, do not throw away the mash.
Measure the bitters and add equal part water to the bitters liquid.
Simmer the bitters until they reduce by half.
Add the reduced water and infused bitter liquid back into the canning jar. Add the original mash back into the jar.
Screw on a lid and ring, shake and allow to marinate for an additional 2 weeks.
After the final 2-week infusion, drain the bitters away from the mash.
Discard the mash and store your homemade bitters in a closed container.