Wikipedia
Orange bitters is a cocktail flavoring made from the peels of Seville oranges, cardamom, caraway seed, coriander and burnt sugar in an alcohol base. Orange bitters, which are not to be confused with standard Angostura bitters, are currently enjoying a resurgence among cocktail enthusiasts. For many years, it was difficult to find orange bitters in the United States and elsewhere. Because of this, some cocktail recipes which traditionally contained orange bitters may now exclude that ingredient. Fee Brothers of New York has been producing orange bitters for many years, but distribution was limited. Since 2006 The Bitter Truth in Germany has produced all natural orange bitters and there are now a number of different brands on the market.
Usage examples of "orange bitters".
Besides the new bottle of gin, his cellar consisted of one half-bottle of Bourbon whisky, a quarter of a bottle of Italian vermouth, and approximately one hundred drops of orange bitters.
When I came back she was mixing gin, vermouth and orange bitters in a quart shaker, not leaving a lot of space for them to move around in.