Irish Coffee, or so the lore would have it, was invented at Shannon Airport on the west of Ireland as a warmer for trans-Atlantic travelers in the 1950s.
A classic Irish coffee consists exclusively of hot coffee, Irish whiskey and sugar, with cream floated on top. It is made as follows:
Nutmeg, cinnamon, or another spice may be added, but are not usual.
An alternative version, more properly known as "Bailey's Coffee", adds an ounce of Baileys Irish Cream, a liqueur to the mix, or may replace the whiskey with the Baileys altogether.