Britons eat more Choux de Bruxelles than anyone else in Europe. It is a traditional accompaniment with Christmas turkey in Britain. But, ask some over there, how will Christmas dinner be different after Brexit? No Brussels. Groan.
Botanically, they are the edible buds of a member of the cabbage family, Brassica oleracea var. gemmifera. While their forerunners were likely cultivated in Ancient Rome, that mine of veggie information Rebecca Rupp (1987), notes that Mark Antony ate ballata gemmifera ('diamond-makers' since they were said to enhance mental powers), unsuccessfully, before meeting August Caesar at the Battle of Actium, but the Roman references may have been describing a very small form of heading cabbage.