a whole herring, a small, oily fish, that has been split into a butterfly fashion from tail to head along the dorsal ridge, gutted, salted or pickled, and cold-smoked over smouldering woodchips (typically oak).
In the United Kingdom, the Isle of Man, Japan, and a few North American regions, they are often eaten for breakfast. In Great Britain, kippers, along with other preserved smoked or salted fish such as the bloater and buckling, were also once commonly enjoyed as a high tea or supper treat, most popularly with inland and urban working-class populations before World War II.
Kippers and bacon? His stomach began to shrivel and fold in on itself.
Stephen King. The Stand (1990)
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Blackadder: Look, for God's sake, MacAdder, you're not Rob Roy, you're a top kipper salesman with a reputable firm of Aberdeen fishmongers. Don't throw it all away. If you kill the prince they'll just send the bailiffs 'round and arrest you.
BBC. Blackadder, season 3: Duel and Duality
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Lunch had been herring, pickled. And the pungent scent now wafting up the stairwell strongly intimated that breakfast was to be herring, kippered.
Diana Gabaldon. Outlander (1991)
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He opens it and shows it full of polonies, kippered herrings, Findon haddies and tightpacked pills.