Fish Finger and Tartare Sauce

The tub of tartare comes out of the fridge alongside the box of fish fingers, and reaching for it instead of the ketchup bottle settles what kind of sandwich this becomes. Tartare is no smooth condiment. It is a bound, emulsified mayonnaise carrying chopped capers, chopped gherkins, a squeeze of lemon or a splash of vinegar and often parsley, and that loaded make-up is its entire job. The crumbed fish holds steady, a baton of mild white meat in a brittle orange shell, while the sauce meets it with a built-in sourness and a scatter of small briny pieces that break an otherwise even, fried bite. This is the version a cook makes when they want the sauce to answer back.

The whole sandwich turns on one collision: a hot crisp coating going down against cool soft bread, with nothing in between to soften the line. The crumb is the only crunch the build owns. Fry the fingers pale and that shell goes steamy under the lid of bread, and the contrast vanishes into one soft mouthful; fry them deep and the shell shatters as the slice presses down, shedding loose crumb into the sauce. The window for a finger that stays brittle under butter and warm bread is narrow, and a wet sauce closes it fastest, which is the first reason tartare has to behave rather than spread.

The craft is the sauce keeping its shape against the fry. Because it is emulsified, tartare sits as a thick clinging band rather than a slick that runs, and that body is the point: it goes onto the fingers as a deliberate ridge, not smeared thin where it would soak the bread and drown the crumb. The capers and chopped gherkin keep their own firmness even against warm fish, so the snap of pickle outlives the first bite, and the lemon or vinegar in the base lifts the fried oil without thinning the sauce to a drip. Soft white bread, buttered to the edge, keeps the base from drinking fish oil and the sauce's faint moisture before it reaches the mouth.

The acid is doing one specific thing the sweeter sauces cannot. Fried white fish lands flat and oily on its own, a single even note from crumb to flake, and tartare answers it not with sugar but with sour and salt, the capers bursting briny and the lemon prickling at the back so the mayonnaise never reads as plain fat. Ketchup sweetens that oily note; tartare cuts it. The gherkin gives a vegetal snap the soft fish never could, and the chopped pieces stay scattered through the band rather than melting in, so each bite carries a little jolt against the steady fried baton underneath.

Push any part and it breaks in a particular way. Tartare smeared thin and wide loses the job entirely, the chopped pieces stranded and the acid faint while the bread underneath turns wet; piled on heavy it slides and floods and the briny bits drown one another. An overdose of lemon turns the whole bite sour rather than lifted. Bread left dry under the band soaks up the oil and goes papery; toasted hard it cracks the soft fingers as the lid comes down. The build holds only in a tight middle, hot fish and cold sharp sauce caught before either gives.

Press the top slice and a little sauce wells at the cut edge, pale and flecked green and yellow against the orange crumb. The shell crackles first, then the cool sharp lumpy sauce hits and the capers burst small and salt-sour between the teeth, then the hot mild flake comes up underneath, ready to scald a careless palate. A stray caper rolls toward the corner and a fingertip nudges it back, butter greasing the path. It is a warm, soft, brittle bite with a cold sharp argument running clean through the centre, and the argument is what pulls a nursery food onto an adult plate.

Choosing tartare carries a grown-up register the red bottle gives up. This is the chip-shop sauce, the tub that comes with battered cod and scampi, the one a fish supper expects, and spooning it onto the fingers pulls a teatime sandwich toward the fryer and the seaside. The fish finger reaches British kitchens straight from the 1950s freezer aisle; the sauce dressing it here had been sat on the fried-fish table for half a century before that, and the gap between those two dates is the oddity the history below accounts for.

A 1955 product meets a Georgian sauce

The fish finger is the younger half by a wide margin. Birds Eye, named for the frozen-food pioneer Clarence Birdseye, launched it from the company's Great Yarmouth factory in 1955, and the product nearly went to market as something else entirely: the original prototype was a herring savoury, dropped after cod beat herring in taste tests run on the public of South Wales and Southampton between 1953 and 1955. The women on the production line voted to call the breaded cod batons fish fingers over the proposed "battered cod pieces." Six hundred tonnes sold in that first year. The cartoon Captain Birds Eye, the brand's bearded skipper, did not arrive until 1967, a dozen years after the food itself.

The sauce predates all of it. Tartare descends from formal French cookery and was settled across the nineteenth and early twentieth centuries by named cooks: Alexis Soyer gave a sauce a la tartare with cornichons, capers and shallot in 1849, Jules Gouffe placed it in the mayonnaise family in his Livre de cuisine of 1867, and Auguste Escoffier fixed it in Le Guide Culinaire of 1903 as a standard accompaniment for fried fish, the exact role it plays here. An English instance of the cold, pickle-cut style turns up far earlier, in John Nott's Cooks and Confectioners Dictionary of 1723. The earliest English use of the word tartar for the sauce is recorded around 1824.

The joining of the two belongs to no one. No cook can be named for first banding tartare along a fish finger, and the moment went unrecorded; it is simply what happened once a postwar freezer product met a condiment that classic cookery had long since married to fried fish. The pairing is now fixed enough that when Birds Eye ran a Fish Finger Sandwich Award in 2017, the winning builds leaned on tartare and capers rather than ketchup, and the sandwich sits regularly among Britain's most-named, fourth in one Hovis survey of two thousand people behind the BLT, chicken salad and tuna.