Mix the solids, reduce to a fine powder and extract by slow percolation with the alcohol.
To prepare the bitters, mix 1 ounce of the above extract with 18 ounces of water and 12 ounces of alcohol.
Boker’s Bitters
by Darcy O'Neil :: [Bitters]
A well know bitters from the 1800s that was used in some cocktails. You can purchase Boker's Bitters at Dr. Adam Elmegirab's Bitters