
Boker’s bitters is a historic brand of aromatic cocktail bitters marked by cardamom, bitter orange peel and dark spice.
The bitterness is common to the family; the cardamom-and-citrus top is not. Build it back with a pinch of cardamom or a dash of a citrus bitters over an ordinary aromatic, and dose by the dash as before.
Aromatic bitters (Angostura-style)
The wider family, led by clove, cinnamon and gentian rather than by cardamom. Dash one in place of the other and the drink turns warm and spiced where it should read bright and faintly floral.
The original recipe was lost with the brand in the 1920s: what is on the shelf is a reconstruction "in the Boker’s style" rather than the historic bottling.
Another revived nineteenth-century recipe, and the same caution applies: batches differ, so taste before you trust a new bottle to behave like the last one. Nothing here spoils; the alcohol sees to that.