Orange bitters

Orange bitters is a form of bitters, a cocktail flavoring made from such ingredients as the peels of Seville oranges, cardamom, caraway seed, coriander, anise, and burnt sugar in an alcohol base.

[2] For many years, it was difficult to find orange bitters in the United States and elsewhere.

[3] Because of this, some cocktail recipes that traditionally contained orange bitters may now exclude that ingredient.

[6][7] This is done to balance out the candy-like sweetness of Fee's and the heavy cardamom note of Regans'.

[3] Orange bitters can also be made at home, allowing one to create new flavor profiles that are not available anywhere else.