The Irish Coffee is four ingredients and one law of physics: hot sweetened coffee and whiskey below, cold barely-whipped cream above, and the drink sipped through the cream, never stirred. Chef Joe Sheridan is credited with creating it around 1943 at the Foynes flying-boat terminal on Ireland's west coast, warming passengers grounded by Atlantic weather; a decade later it crossed the ocean and became an American institution. It remains the standard against which every hot cocktail is measured.
Hot below, cold above, and the whole drink happens at the border.
History
The origin is unusually well attested: Sheridan ran the restaurant at Foynes, the seaplane port serving transatlantic flights, and his whiskey-laced coffee for weather-delayed travelers followed the operation to the new Shannon Airport. In 1952, travel writer Stanton Delaplane carried the idea to the Buena Vista Cafe in San Francisco, where he and the owners spent a night perfecting the cream float; the Buena Vista has poured them more or less continuously since — by the thousands per day — and Sheridan himself eventually emigrated to work there.
The Spec
Proportions are simple: a standard pour of Irish whiskey, twice as much strong hot coffee, brown sugar to dissolve, cream on top. The sugar isn't only for sweetness — it raises the coffee's density so the cream floats cleanly.
The Cream Is a Technique
Heavy cream, whipped only until it thickens to pourable ribbons — stiff whipped cream sits like a dessert topping, unwhipped cream sinks. Pour it over the back of a warm spoon so it settles into a distinct half-inch layer. This is the entire skill of the drink; everything else is assembly.
Coffee and Whiskey Choices
A smooth blended Irish whiskey is traditional and correct — its soft grain character folds into coffee without a fight. Brew the coffee strong and fresh; it's two-thirds of the glass, and a stale pot has no whiskey cure.
Bottom Line
The Irish Coffee is hospitality distilled: hot, sweet, strong, and finished with a flourish anyone can learn and few bother to. Do not stir it, do not use canned cream, and do not save it for winter only — the Buena Vista sells them in July.