Guinness and Harp. Left Hand Milk Stout and Longboard Lager (try it). However you drink a black and tan, you need a really good tool for the job. Sure, you could use a spoon for free but for $10 more you could get a foolproof device that consistently makes an amazing black and tan. Stainless steel, easy to clean, and an exact fit to most beer glasses, the Perfect Black And Tan layering tool is a great gift or stocking stuffer. It was built for one purpose and it gets the job done. What more could we ask?