
Boker's bitters is a historic brand of aromatic cocktail bitters marked by cardamom, bitter orange peel and dark spice.
Dark spice leads, carried by cardamom and bitter orange peel over a firm bitter backbone.
Dashed in small amounts as a seasoning rather than a base measure, it accents a build with spice and bitterness; its ABV is high but negligible in practice at this dose.
Another aromatic bitters fills the role in most drinks, since it is dosed as an accent — but the cardamom/bitter-orange/dark-spice signature will not carry over, so substitution breaks down in recipes built specifically around that profile.
Aromatic bitters (Angostura-style)
Boker's-style bitters lead with cardamom, bitter orange peel and dark spice, whereas the dominant modern aromatic bitters style is built on a gentian- and cinchona-driven profile; they are used identically in dashes but are not interchangeable one-for-one in flavour.
Johann Gottlieb Böker created the original as a proprietary New York product, and modern producers now reconstruct a "Boker's-style" category from its known character. As an aromatic bitters it is a high-strength spirit base infused with bittering botanicals — among them quassia bark — and aromatic spices, including cardamom and bitter orange peel.
Boker's Bitters was created in 1828 by Johann Gottlieb Böker and manufactured by the L. J. Funke Company of New York City; it was specified in nearly every cocktail calling for bitters in Jerry Thomas' 1862 book, and the company closed during the Prohibition era in the 1920s.