Invented by herbalist Bernardino Branca in 1845 in Milan, Fernet-Brancaone of Italy's most popular digestivos, made from 27 herbs from around the world and aged in oak barrels for a year. It's also used in cocktails; in Argentina, it's so popular with Coca Cola that the country imports over three quarters of the national production.
Batman fans may recognize it as the favourite tipple of Bruce Wayne's butler Alfred.
Image by Robert Stribley