Ribollita di Fagioli e Pane Sciocco

Drain the soaked cannellini beans and place them in a large pot. Cover generously with cold water, add the rosemary sprig, and cook at a steady simmer — without salt — until each bean collapses completely when pressed between the fingers. Reserve the cooking liquid. Pass roughly one-third of the beans through a food mill or crush them with a fork to form a coarse purée; leave the remainder whole. The test: a single bean squeezed between thumb and forefinger must offer no resistance.

Warm 60 ml olive oil in a wide, heavy pot over a medium flame. Add the chopped onion, celery, and carrot without stirring for the first two minutes, then cook gently until the onion is fully translucent and the celery has lost its raw edge. No colour should develop. The test: the soffritto smells sweet and faintly savoury, with no sharp raw vegetable note remaining.

Add the cavolo nero leaves to the soffritto and stir to coat in the oil. Pour over enough bean cooking liquid to cover, add the Parmigiano rind, and cook over a moderate flame until the cavolo nero is fully tender and its bitterness has mellowed. The test: a leaf tears without resistance and tastes earthy rather than sharp.

Working in layers and without mixing, add to the pot in sequence: the whole cannellini beans, then the bean purée, then the sliced pane sciocco. Press the bread gently into the liquid so it absorbs fully. Add more bean cooking liquid only if the mass appears too dry to cook through. Simmer over the lowest possible flame, stirring as little as possible, until the bread has fully dissolved into the body of the soup and the consistency is thick enough to support a spoon standing upright unaided. Season with salt only at this point. This is Day 1 — zuppa di fagioli. Remove the Parmigiano rind and the rosemary sprig. The test: a spoon inserted vertically into the centre of the pot stands without tilting.

Transfer the soup to a wide, shallow vessel — a gratin dish or deep tray — spreading it to an even depth of approximately 4–5 cm. Allow to cool completely at room temperature, then refrigerate overnight until the mass is fully set and firm enough to be sliced cleanly with a knife. This resting is not optional: only Day 2 ribollita is ribollita. The test: the surface holds the impression of a finger pressed lightly into it.

This is where the dish lives or dies. Turn the cold, set ribollita out and cut into rounds or thick slabs. Pour olive oil generously into a heavy frying pan — enough to cover the base to a depth of 2–3 mm — and heat until the oil shimmers. Lay the ribollita rounds in without crowding and fry 3–4 minutes per side without pressing or moving them, until a deep, firm, caramel-coloured crust forms on each face. Alternatively, place slabs in an oiled ovenproof dish, drizzle generously with olive oil, and reheat at 200 °C until the top caramelises and the bread within swells. Either method: the crust is the defining transformation. The test: each round emits a steady, dry sizzle and the underside, when lifted with a spatula, is uniformly deep gold and rigid.

Serve immediately on warmed plates with raw red onion laid over the top and a further pour of raw extra-virgin olive oil. The test: the interior is piping hot and porridge-soft against the crust's resistance.