Like its parent, there's no decor (white-painted brick walls, rough, old furniture, unforgivingly bright lighting) and staff are businesslike, their white uniforms giving them the spurious air of culinary technicians. The menu (which offers timed options, from anchovy buns at breakfast to ox heart with a'oli at dinner) is scrawled on a blackboard. The shaven-headed, goateed men and unmade-up women of this burgh were lapping it up so much that even on a school night there were lengthy queues. Offal, long-out-of-favour cuts and other derided bits of animal have always been a passion of Fergus Henderson, the brains (appropriately) behind St John, and his enthusiasm is reflected here. The blackboard reads like the contents of a bin in an abattoir. Tellingly, on the night we visited, safer options - or simply duller ones, such as plain boiled potatoes accessorised by sorrel and a soft-boiled egg - had already sold out. The crossings out on the blackboard left the remaining choices, like nature, red in tooth and claw.