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1
Warm a generous film of the olive oil in a wide, heavy pot over medium-low heat, then add the crushed garlic, sage, rosemary, and dried chilli. Keep the heat patient and low so the aromatics release their character into the oil rather than seizing and scorching — the oil should smell of garlic and herbs, and the garlic should reach pale gold with no brown edge. Remove and discard the sage, rosemary, and chilli before proceeding.
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2
Add the stripped cavolo nero leaf blades to the pot in batches, turning each addition in the aromatic oil so every surface is coated before the next goes in. Pour over the cold water, add the Parmigiano rind — which will give the broth a quiet, savoury depth as it softens — and bring to a gentle simmer. Reduce the heat to low; the water should just tremble, never boil hard, because a rolling boil will make the broth thin and grey.
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3
Braise uncovered for 30–40 minutes, pressing the leaves down occasionally. This is where the dish lives or dies: the kale must become completely silky and surrendered — not al dente, not chewy — because undercooked cavolo nero will taste raw and fibrous against the soft bread below. Lift a leaf blade and press it between thumb and forefinger; it should offer no resistance and feel soft throughout, and the liquid will have reduced to a concentrated, deeply coloured pot likker, not a clear broth. Remove the Parmigiano rind.
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4
While the kale finishes, toast the slices of pane sciocco until they are firm and pale gold on both cut faces, then immediately rub each slice on one side with the cut face of the raw garlic clove while the bread is still hot, so the warmth opens the crumb and draws the raw garlic in rather than letting it sit on the surface. The bread should be crisp enough to support a ladle of broth without disintegrating instantly, yet porous enough to absorb it — a hollow sound when tapped tells you it is right.
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5
Place one garlic-rubbed slice of toasted pane sciocco, rubbed side up, in the base of each warmed wide bowl, then ladle the braised cavolo nero and its concentrated broth directly over the bread and allow the liquid to soak in for 30 seconds — the pause matters because it lets the bread drink the broth evenly from the edges inward rather than collapsing at the first touch of the spoon. The bread should begin to soften and swell at the edges while its centre remains just structured.
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6
Pour approximately 2 tablespoons of raw extra-virgin olive oil directly into each bowl over the kale, finishing with several turns of freshly ground black pepper. Use the oil raw and at the last moment so its grassiness and slight bitterness are not cooked away — they are the final seasoning of the dish. The oil should pool briefly in the hollows of the leaves before being drawn into the broth.