There are different ways to serve a Black
and Tan. In some cases (in the United States, for example), the beers are
"Layered" on one another, with the Guinness on top. In Ireland, it is
typical to pour both beers into a pint glass at the same time. It is also
common to serve Harp's Lager in place of the Bass, or another light-colored
beer, preferably a lager or an ale.