Which flavor addition is found in all three of these liqueurs: Curaçao, Grand Marnier, and Triple Sec?

C.

These orange liqueurs appear in classic cocktails like the Margarita, Sidecar, Long Island Iced Tea, and Cosmopolitan—no respectable home bar should be without at least one. Liqueur is not the French spelling of “liquor” but a combination of a liquor (a distilled spirit such us vodka or brandy) with added sugar and flavorings. Curaçao was first made by Dutch settlers on the island of Curaçao in the 19th century. A traditionally rum-based liqueur, it ranges from 15-40% abv and is made with tropical oranges. Avoid cheap versions appearing in artificial orange, blue, and green hues—true Curaçao is clear. Grand Marnier was created in 1880 by Frenchman Louis-Alexandre Marnier-Lapostolle from a mix of Cognac, distilled bitter orange essence, and sugar. At 40% abv, Grand Marnier is the incendiary ingredient in Crêpes Suzette, the quintessential French dessert made by dousing a crêpe, or buttery pancake, with it and flambéing briefly. Triple sec is a drier style of orange liqueur, whose name is thought to be a translation of the words “triple dry.” The drink was first released in 1875 and is made using a mix of sweet and bitter orange peels and sugar beet alcohol. Cointreau claims to be the world’s first triple sec producer and is 40% abv.