Germany
The Bitter Truth has created their own interpretation of the bitters called for by name by legendary bartender Jerry Thomas over 150 years ago in The Bar-Tender's Guide. After 10 years of research, and using a bottle of the original bitters produced around 1900, Bogart's Bitters are sure to give your cocktails new layers of complex flavours.
Fun note on the name: "Bogart's Bitters" is thought to have been printing error, with the actual name of the bitters used by Jerry Thomas being Boker's Bitters.

Nothing else compares to this wonderful creation. It makes a good whisky great and an OK whisky better.
Incredible product, this bitter have such complexity that is second to none. It can be really be a cocktail drink by itself such its variety of flavours. You can totally see the way and reason it was used to produce the first cocktails. For such complexity I would use 1 to 2 drop max in my shaken Campari. Highly recommend for the old and new bitters lovers.