Wiktionary
n. 1 (context countable English) A type of bun containing currants. 2 (context uncountable English) (''Cockney rhyming slang'') The Sun (''the celestial body''). 3 (context uncountable English) (''Cockney rhyming slang'') http://en.wikipedia.org/wiki/The%20Sun%20(newspaper) (''the British newspaper'').
Wikipedia
A currant bun is a sweet bun that contains currants or raisins.
The Chelsea bun is a variant. Neither should be confused with a spiced bun, nor with a similar cake called the tea cake. Nor should it be confused with the scone, a form of cake that is also likely to use currants but which is generally smaller, and which is usually eaten with butter or some butter substitute.
Currant Bun is English rhyming slang for the tabloid newspaper The Sun.
Usage examples of "currant bun".
I bought him a currant bun and myself a rock cake and a cup of tea and took them back over to the Treasure Hunt.
The more general view, however, was that an atom was more like a currant bun or a plum pudding: a dense, solid object that carried a positive charge but that was studded with negatively charged electrons, like the currants in a currant bun.
In between the University's Great Hall and its main door is a rather smaller circular hall or vestibule known as Archchancellor Bowell's Remembrance, although no one now knows why, or why an extant bequest pays for one small currant bun and one copper penny to be placed on a high stone shelf on one wall every second Wednesday [15].
Listen, with the old currant bun beaming down and a bottle or two of duty-free on the patio table we can give the matter serious thought.
This is all very interesting, said Tom Smith, taking a currant bun.
As for the antagonistic Element, I've lived with my Uncle Sebastian all my life, and the worst clash we ever had was over which of us got the last currant bun at tea.