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1.
A mixed beer drink, similar to a black and tan, comprised of Guinness floated over Stella Artois. The ratio of Guinness to Stella should be slightly higher than in a black and tan.

The plural form is placed on the first word, as in:

singular = black on blond
plural = two blacks on blond

See also blond redhead
Make it a black on blond, squire, and keep 'em coming!

A round of blacks on blond for the table, right?
by Quackenblatz March 21, 2008