Selfridges, the only UK stockists of the US invention, sold its entire stock in 48 hours and is urgently seeking more, reports the Daily Mail.
Mo's Bacon Bar, which contains chunks of applewood smoked bacon combined with smoked salt and milk chocolate, sells at a pricey £5.99 per 3oz bar.
Ewan Venters, food and restaurant director at Selfridges, said: "Bacon and chocolate sounds like a strange combination, but the execution is fantastic. It's a real explosion of flavours and people love it."
But the Daily Mail's Claudia Connell, a self-confessed chocolate addict and bacon fan, described it as "the most unpleasant thing ever to have passed my lips".
"The chocolate is intensely salty and the smokey bacon pieces are horribly out of place in something so sweet. The whole sensation is like eating chocolate that has been dunked in an overflowing ashtray," she wrote. (Daily Mail)