Bath Bun Sandwich

A Bath bun comes to the board already sweet. Its top is crusted with crushed sugar, it is often studded with candied peel or currants, and it sometimes hides a lump of sugar baked into its base. Split one through the middle to make a sandwich of it and the bread is the loudest thing on the plate before any filling goes in, a flavoured component carrying its own sugar that whatever you spread has to answer rather than ignore. The bun is the named star here, sold under its own name in West Country bakeries, and the filling is the supporting note.

That sweetness sets the whole problem of what to put inside. The plain build splits the bun and spreads it with salted butter and nothing else, and the salt is doing real work, a savoury counter that keeps a sweet crumb under sweet butter from collapsing into one flat sugary register. Where a filling is added it leans on contrast rather than echo: clotted or whipped cream with a little sharp jam pushes the bun toward a cream tea, and a tart fruit compote cuts the sugar instead of adding to it. A filling that is also sweet has nothing to push against and the whole thing goes cloying.

The bun's richness is also a structural limit. It is tender and short-crumbed, so it tears rather than slicing clean, and it cannot carry a heavy or wet load without going to mush, which is precisely why the fillings that suit it are light and either fatty or sharp. Overfill it with cream and the base buckles and the sugar crust slides off the top. Pile in anything savoury and substantial and the sweetness fights it rather than framing it. The bun was made to be eaten sweet and whole, and the sandwich version works only when the filling respects how little weight the bread will bear.

Warm or fresh, the bun is the experience. The first thing is the smell of enriched dough, eggy and sugared, closer to baking than to bread, with the faint resin of candied peel. The sugar crust crackles and grits against the teeth, the crumb is soft and gives at once, and a cool spread of salted butter or cream against that warm sweetness is the contrast the whole thing is built around. It is plate-and-saucer food, eaten with the hands at a tea table, sweet and rich and gone in a few bites.

It sits in a small family of West Country enriched bakes and is the sweet, decorated one. The Sally Lunn is the plainer and far larger neighbour, a tall brioche-like bun built to be split and dressed savoury or sweet, where the Bath bun is sweet through and through; the lardy cake takes the same rich instinct toward fat and dried fruit into a sticky slab. The teacake is leaner and fruited and meant for toasting. Among them the Bath bun is the one whose own sweetness is the point, which is what makes a sandwich built on it an argument about balance rather than a neutral carrier.

Sugar Comfits and a Million Buns

The Bath bun has a real documentary trail, and it is older and plainer than the legend stitched to it. The popular story credits an 18th-century Bath physician, Dr William Oliver, with inventing a rich bun for his patients at the spa, then switching them to a hard dry biscuit when they put on weight; that biscuit, the Bath Oliver, is real, but the bun's link to Oliver is folklore, not record. The bun appears in print by 1763, and Jane Austen, living in Bath, wrote to her sister Cassandra in January 1801 of disordering her stomach with Bath buns, with the extra n she liked to give them.

The recipe trail is the firmer ground. The Bath resident and cook Martha Bradley printed a Bath seed cake in The British Housewife in 1756, and Elizabeth Raffald followed in 1769 with Bath cakes, yeast-raised rolls enriched with butter and cream and flavoured with caraway comfits, sugar-coated caraway seeds. That early bun was a brioche-like dough strewn with those sugared seeds, lighter and less fruited than the heavy, sugar-crusted bun sold today.

By the middle of the next century the bun was a fixture and the sugar had taken over. Chambers's Edinburgh Journal in 1855 described the Bath bun as rich and handsome, yellow with the golden yolk of eggs and wealthy in butter and sugar, decorated with white sugar-plums and coloured comfits and almonds, a picture of a bun being eaten as a sweet indulgence rather than a plain roll. The decoration the journal lingered on, the crushed sugar and the candied bits, is exactly the part that makes the bun a difficult thing to put a savoury filling against.

The shift to the heavier modern bun is usually dated to a single event, the Great Exhibition of 1851 in London, where Bath buns were sold in enormous numbers, by most accounts close to a million over the five and a half months of the fair. The cheaper, denser "London Bath bun" baked for that crowd, leaning on sugar and dried fruit, is what pulled the recipe toward the sweet, crusted form the sandwich now splits and butters; the lighter caraway-comfit bun of Raffald's 1769 page is the one it left behind.