What is "black and tan"?

Black and tan is a beer cocktail that is made by layering two different types of beer in a single glass. Typically, a lighter beer such as lager or pilsner is poured first, followed by a darker beer such as stout or porter. The two beers will naturally separate, with the lighter beer on top and the darker beer on the bottom, creating a striking visual effect. Black and tan is a popular drink in Irish pubs and is often associated with St. Patrick's Day celebrations. While the drink is easy to make, it requires some skill to pour the beers in a way that they do not mix, and there are specific tools such as a black and tan spoon or a special pour spout that can be used to achieve a perfect separation of the two beers.