Irish coffee is a hot cocktail made with hot coffee, Irish whiskey, brown sugar, and whipped cream. It is a popular after-dinner drink that originated in Ireland.
Irish coffee recipe
Pour the coffee into a preheated glass, add whiskey and sugar, and stir until dissolved. Pour cream slowly to form a distinct layer.

A well-made Irish Coffee is rich but not heavy: warm roasted coffee, mellow whiskey spice, gentle sweetness, and a silky cold cream finish. The contrast matters as much as the flavor. You want a hot base and a cool floating top, with enough sugar to round out bitterness and support the cream.
Use strong coffee rather than something thin or acidic. A medium to dark roast usually works best. The cream should be cold and only lightly thickened; if it is too loose, it disappears, and if too stiff, it sits like whipped topping instead of forming a smooth layer. A clear glass or classic Irish coffee mug shows off the layered look best.
Irish Coffee is most often linked to Joe Sheridan, a chef at Foynes airbase in Ireland in the 1940s, who reportedly created it to warm cold transatlantic passengers. The drink later became internationally famous after being introduced in the United States, especially at the Buena Vista Cafe in San Francisco. Exact retellings vary, but that Foynes origin is the most widely accepted account.
For a zero-proof take, use a robust decaf or regular coffee with a spoonful of brown sugar and a splash of alcohol-free whiskey alternative, if available. Top with the same lightly whipped cream. You still get the signature hot-and-cool contrast, with much of the original comfort intact.