With only two ingredients, this is an easy beverage to celebrate St. Patrick's Day. I'd much rather drink this two tone drink, than a tall glass of GREEN beer. Not much into green drinks or green food anyways, sorry Dr. Seuss. To make a black and tan, you need a light and a dark color beer. Carefully pour half of a light beer into a beer glass. Grab a spoon and flip it so that you use the dome of the spoon to help you pour the dark beer. Place the spoon dome side up inside the glass placing it at an angle against the glass. Pour half the stout beer over the spoon. Let the dark beer trickle the side of the glass to avoid splashes.
To obtain the two distinct layers of beer, let the glass stand for a couple of seconds. The classic Black and Tan most beer drinkers know is either Bass Ale or Harp Lager topped with Guinness Stout. There you go!
Happy St. Patrick's Day.