Orange Liqueurs is a group of liqueurs using the flavour of the bitter bergamot orange as its base, similar to the flavours of Earl Grey tea. There are many variations on the theme of Orange Liqueur, including: Cointreau, Curaçao and Grand Marnier. Orange liqueurs can be drunk as cocktails, in orange-flavoured sauces and in pancakes or soufflés.
Dowell, P., Bailey, A. (1980) The Book of Ingredients, Dorling Kindersley. ISBN 0718119150.