Cómo se hace:
POUR lager into chilled glass then FLOAT Guinness on top.
A layered drink with Lager downstairs and Guinness upstairs. If poured correctly these two beers make a perfect "black and tan" layer in the glass.
It’s likely that the term “black and tan" originated in England, where different beers have been blended since at least the seventeenth century. The earliest written usage of the term in this context is from 1881.