We started the St. Patrick's Day festivities with this smooth drink. I am not a fan of beer, but I do enjoy Prosecco. This is a wonderful blend of Guinness and Prosecco. The proportions are roughly two parts bubbly to one part Guinness, but you can mix it to taste. Like Irish Coffee, this drink is found all over Ireland. This is an excellent party drink. You can mix it to order as your guests arrive.
For one serving:
4 ounces chilled Champagne or Prosecco
2 ounces chilled Guinness Extra Stout
Pour the champagne into a flute or other tall glass (I didn't follow the directions here. I like it in a rocks tumbler.)
Pour the Guinness on top. Guinness is heavier. If you mix it the other way around, it won't combine evenly and will need to be stirred.
From David Bowers' Real Irish Food.