One mug should be preheated by filling it with hot water, then emptying it. It should then be filled with hot coffee until it is about 3/4 full. Brown sugar is added and stirred, followed by the whiskey. Heavy cream is then poured over a spoon held just on top of the coffee, which adds the top layer and completes the drink. The cream floats on top due to the sugar.
In Spain, Irish coffee is sometimes separated into three layers. The bottom layer has whiskey, the middle layer has coffee and the top layer has cream. In southeast Asia, Irish coffee sometimes uses iced coffee. Cream may or may not be added.
A chef named Joe Sheridan invented the drink in the 1940s. He served the drink to a group of American travelers who had just arrived in Ireland during poor weather conditions. He added the whiskey to their coffee to warm them. Stanton Delaplane, a travel writer, is said to have brought Irish coffee to the United States in 1952, but others claim to have made the drink first.Learn more about Coffee & Tea