Fish and Chips
Fish and Chips is an English dish of battered fish, deep-fried, served with pieces of deep-fried potato. Malt vinegar and salt are the traditional condiments that will be offered free to go with it. Ketchup is a less popular option.
The deep-fried potato pieces are what the English call chips. They are thick-cut French fries. In America, fish and chips is likely to be fish and French fries.
Traditionally, Fish and Chips has been a take away meal, as opposed to delivery service or a sit-down restaurant meal, but there are several fish and chip chain restaurants now. For take-away, the fish and chips are placed on a piece of white grease-proof paper, then wrapped in newspaper to keep them warm. Now, clam shell cases or cardboard boxes are common.
The shops selling Fish and Chips are often referred to as "chippies", or "the local chippy."
From the 1960s to the 2000s, the Maris Piper was a favourite potato used at chippies. Common fish used include cod and haddock. Others are plaice, pollock, skate, etc. But it's always a white fish. Under EU directive 2065/2001/EC, in the UK you can't just sell "fish and chips" now; you have to mention the species of fish, i.e. "cod and chips."
There are some regional preferences. In West Yorkshire, for instance, "jumbo haddock" fried in beef dripping was and remains popular. Jewish fish and chip shops, such as Cantor's in Leeds, were amongst the first to fry in oil instead.
Since the late 1900s, the Fish and Chip trade has been hit by a perception of being unhealthy food (as people reach for 4,000 calorie burritos instead), and by the rising cost of fish. Still, many people feel that a Fish and Chip meal still represents good meal value for your money, in terms of being filling, and in terms of providing a good portion of healthy fish.
Friday was always a busy day at chippies, because Friday was meant to be a meatless day. It also provided Mum an easy way to put a treat meal on the table at the end of a work week.
Fish and Chip shops in Australia will often bread crumb the fish instead of battering it, to the horror of travellers from abroad.
Some prefer crispier chips, and so hesitate about putting the vinegar on. To solve this apparent dilemma, an American firm, J&D's, released Malt Salt in October 2010. Malt Salt is malt vinegar flavoured salt.
"Fried fish, although becoming more popular in town, especially near pubs, was still mostly considered a racecourse delicacy. At Epsom in 1850 there were fifty fried-fish sellers, whose customers were mostly the boys who held the carriage-horses' heads and did odd jobs, or were themselves sellers of other goods. Fried-fish sellers charged a penny for a piece of fish and a slice of bread, sold from newspaper-lined trays that hung from straps around their necks." -- Flanders, Judith. The Victorian City. London: Atlantic Books. 2012. Page 286.
The combined dish emerged during the industrialization of Britain. The first Fish and Chip shop appeared around the early to mid 1860s; it's disputed whether it was in the industrial areas of northern England, or in London.
The London candidate is the shop opened in 1860 by Joseph Malin, who was Jewish, on Cleveland Street, London in 1860. Some sources feel, though, that he didn't start selling chips combined with fried, battered fish until 1865. In any event, Malin's went on to become a small chain of fish and chip shops in London called "Malin's of Bow." [Ed: The business was bought out in 1969 by the American company Arthur Treacher, both the name and the recipes.]
The northern candidate is the business started by a Joe Lees in a wooden hut in the market at Mossley, near Oldham, in Lancashire. Lees had worked as an engineer at an Oldham cotton mill. He devised a portable fryer he called "the Dandy", with a tall chimney, to use at his market stall. He sold the fish, and gave away the chips. In 1863, Joe Lees moved from the market to a permanent shop in Mossley, calling the eatery "Lees's Chip Potato Restaurant."
Still, even by the 1880s, there were many fried fish shops in London that were just as likely to serve their fried fish with bread instead of chips:
"They nearly all of them hurried to the local cookshops to spend their few halfpence. In many instances it was only one penny a girl expended. Experience, no doubt, has taught them what is the best value for such a coin obtainable in that region, and the popular voice is unmistakably in favour of a thick slice of bread and a piece of fried fish - not a large one, no bigger, perhaps, than the palm of one's hand - but possessed of potent "relishing powers," if a judgment may be formed on the extraordinary long way off that the fried fish shop appeals to one's sense of smell: and capable of bestowing an appetising flavour to the last bite of the thickest slice that might be cut from a loaf." 
The predilection for bread with fried fish still survives today in the slices of buttered bread that people often eat with their fish and chips.
The first chippy in Dublin, Ireland, was opened by a Giuseppe Cervi sometime in the 1880s. He first sold chips outside pubs, then opened a permanent shop on what is now Pearse Street, which his wife, Palma, helped him with. Reputedly, she originated the phrase "one and one" by asking customers if they'd like one order of fish, and one order of chips.
By the 1900s, Fish and Chip shops were becoming common in urban areas of any size in England and Scotland. By 1910, there were about 25,000 fish and chip shops in the UK, mostly run by families, which provided lunches and early evening meals to working class people.
The National Federation of Fish Friers was founded in Manchester in 1913.
The whole industry got a boost in 1920, with the invention of a mechanical potato peeler for the shops.
The Fish and Chip business peaked in the UK in 1927, at around 35,000 shops.
It was only in the 1930s, though, that Fish and Chips started to be seen as something other than just a meal for the working classes.
Mass acceptance was guaranteed by World War II, as Fish and Chips were one of the few foods not rationed. Fish was not rationed, nor were potatoes, thought cooking fats were in scarce supply. Still, Winston Churchill always vetoed any mention even of putting them on a rations list, out of concern for the morale impact that might have.
UK immigrants to Australia, Canada and New Zealand established Fish and Chip shops there, where they vied with Chinese restaurants for popularity.
Up until about the 1950s, most fish that were caught in Britain went to the Fish and Chip market. By the 1950s, though, the Fish and Chip market began losing its position as the default take-out, as ethnic take-out restaurants started to appear more in the UK, particularly Indian and Chinese.
Literature & Lore
In 2011, a team of research psychologists headed by a Professor Charles Spence at Oxford University concluded that eating fish and chips with your fingers, particularly by the seaside with the sound of waves, would convince the brain that they tasted better than usual. 
On Saturday, 2 July 2011, The Wensleydale Heifer pub in the Yorkshire Dales National Park set a Guinness World Record for preparing the largest portion of fish and chips ever. The serving comprised one single, whole portion of battered halibut weighing 40 pounds (18 kg), and 60 pounds (27 kg) of hand cut chips. A pan had to be custom-made to fry the fish in. Four gallons of batter were required to batter the piece of fish. The fish and chips were accompanied by a vat of mushy peas.
 Hayward, Stephen. Fish and chips taste better beside the seaside, say scientists. London: Daily Mirror. 20 February 2011.
Edwards, Anna. Now THAT'S a fry-up! Pub that's battered its way to world record for largest portion of fish and chips. London: Daily Mail. 3 July 2011.
Hegarty, Shane. How fish and chips enriched a nation. Dublin: The Irish Times. 3 November 2009.
Howard, Philip. Century of Fish and Chips. London: The Times. 27 September 1968.
Is Man's Wok Britain's oldest chippy? Tameside Advertiser. 14 April 2004.
Wallop, Harry. Vinegar or salt on chips? How about vinegar salt? London: Daily Telegraph. 4 October 2010.
Wyke, Nick. The UK's Top 10 fish and chip shops 2010. London: The Times. 19 January 2010.
Fish and Seafood DishesAhtapot Salatasi; Angels on Horseback; Bouchées à l'Armoricaine; Bouchées à la Bénédictine; Cabbie Claw; Chikuwa; Crappit Heids; Dublin Lawyer; Fish and Chips; Fish and Seafood Dishes; Homard à l'Américaine; Kamaboko; Kanikama Crab Sticks; Krappin and Stap; Lobster Newberg; Oysters Kilpatrick; Oysters Rockefeller; Paella; Pot-en-Pot Québecois; Poutine; Sardeles Pastes; Shrimp Cocktail; Squid Balls; Stargazey Pie; Tekka-Don; Yuzu Gama
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