Ham and Tomato

The plain ham sandwich gets its answer here from water rather than vinegar. Cooked ham is salty, dense and dry, and a cool slice of raw tomato brings the one thing it most lacks, a soft, faintly sweet wetness that loosens the bite and brightens the salt. That same virtue is what makes it precarious, because a raw tomato will not sit still. It bleeds. Everything in the making is the management of a wet component bent on turning the crumb to paste, which is why this is the cold-ham sandwich most punished by being made too far ahead. It is also the one Britain most often eats made far ahead, sealed in a plastic wedge under a chiller light, and most of its modern story is the gap between those two facts.

The defence is plain. Salt scattered on the cut slices draws moisture to the surface within minutes by osmosis, where it is blotted off before the tomato meets the bread, and the same salt seasons the slice from bland to bright. The tomato then goes against the ham rather than the crumb, so the dense meat takes the first of any bleed, and butter spread firmly to the edges sits as a waterproof film between the wet slice and the soft base. A ham and tomato built without that butter slumps within the hour. Done at a kitchen counter this is a ten-minute job; done for a chiller cabinet it is an engineering specification, and the wrapped triangle survives a morning on the shelf only because the layering has been worked out and tested, in some plants literally in a lab.

That chiller is the sandwich's real home. Marks and Spencer launched Britain's first packaged-sandwich line across a handful of stores in 1980, white triangles sold for under fifty pence, and the cooked-ham fillings that followed put ham with tomato among the cheap savoury defaults of the cabinet, the unfussy middle of the ham range ordered without a thought. What fixed it as a daily habit was less the sandwich than the bundle around it. The pharmacy chain Boots pioneered the lunchtime meal deal in 1999, after building the first systemised sandwich production in 1985 so the same wedges sold in every branch, and a packaged ham and tomato is exactly the cheap workhorse main that a sandwich-plus-crisps-plus-drink offer is built to move. Tesco's version sat unchanged at three pounds for roughly ten years before it crept upward, and a ham and tomato held near the bottom of that price the whole time.

Open one and the smell is cool and clean, the green sweetness of raw tomato over the faint salt of the ham; the slice gives water as the teeth go through it, the meat is chewy against it, and a bead of juice wells where the bread was cut and wants catching before it runs to the wrist. The points of failure all trace back to the water. Skip the salt and the blot and the tomato weeps straight into the bread and the base is grey by lunchtime. Slice it thick and watery and the disc shoots out the far side under any pressure. Lay the ham mean and thin and the tomato's bleed has nothing to hit and the salt nothing to balance, and the whole thing tastes faintly of wet bread.

There is a cooked-ham cousin that solves the wetness the older way, with a leaf rather than a slice. Ham and watercress was a standing pairing of the Victorian tea table and the railway buffet, the peppery cress doing the lifting a tomato now does without ever threatening the crumb, and by most accounts watercress reached London cheaply once the Mid-Hants line out of Alresford opened in the 1860s and carried Hampshire cress to the city markets by morning. Where that build leans on a dry, sharp leaf, the tomato version stakes everything on a wet, sweet slice, and takes the greater risk for the cooler, fresher mouthful.

The Ham Sandwich on the Street

Ham between bread is among the oldest commercial sandwiches in Britain, and its hardest dated record comes from the Victorian street. In his survey London Labour and the London Poor, the journalist Henry Mayhew counted the city's ham-sandwich sellers in 1851 and reckoned that sixty of them, each taking about eight shillings a week, sold some 486,800 ham sandwiches a year from the pavements of London, a trade he noted had sprung up only in the previous decade.

Mayhew's hawkers sold the ham plain, on buttered bread, with no tomato. The cool raw slice is a later refinement that waited on tomatoes being cheap, reliable and trusted as food, which in Britain was largely a twentieth-century condition rather than a Victorian one. The pairing of salty cured meat with a wet acidic slice carries neither an inventor nor a first date; it is the obvious next move once both halves sat on an English table, and obvious moves rarely come with a name attached.

What can be pinned is the machinery that made it an everyday object rather than a kitchen one. The bare original was a street trade Mayhew could count to the sandwich in 1851; the tomato version is a chiller-cabinet product whose life runs through dates that are matters of record, M&S's 1980 line and the Boots meal deal of 1999, the two inventions that between them turned a sweating slice of tomato into something a plastic wedge could carry through a working morning.