I recently received a free Bass brolley and, not particularly knowing what I was doing, followed the rather simple instructions to make myself several Black and Tans using Bass Pale Ale and Guiness Extra Stout. I've now been informed that I was not supposed to use Guiness Extra Stout, but Guiness Draught and that I also could have substituted Harp's Lager to make a Half and Half, which is similar.
What is the correct way to make a proper Black and Tan and what are your favorite variations on the theme for those that like to break with tradition and try something different? I have attached a picture of the device, so feel free to tell me what a twit I am for using it. ;-)