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1
Combine the buckwheat flour, 00 flour, and salt in a bowl, then add the warm water gradually, working the mass until a firm, cohesive dough forms — not sticky, not crumbling. The 00 flour is here to give the dough enough binding strength so that the buckwheat, which has no gluten of its own, does not crumble when you roll and cut it. Knead for 8 minutes; the dough is ready when it holds its shape under pressure without springing back aggressively.
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2
Wrap the dough and rest it for 20 minutes at room temperature so the flour fully absorbs the water and the dough relaxes enough to roll without tearing. On a lightly floured surface, roll out to a thickness of 3–4 mm — buckwheat dough is less forgiving than white pasta dough and will crack if forced thinner. Cut into strips 5–6 mm wide and 7–8 cm long and set aside on a floured board.
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3
Bring a large pot of well-salted water to a full rolling boil, add the potato cubes, and cook for 5 minutes, then add the shredded Savoy cabbage and cook a further 5 minutes — staggering the two vegetables so both arrive at tenderness at the same moment the pasta is ready. Add the pizzoccheri and cook for 8–10 minutes; buckwheat pasta requires longer cooking than white pasta, and the pizzoccheri are done when they are tender through with no grittiness at the centre — test by biting a piece clean through.
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4
This is where the dish lives or dies. While the pasta finishes cooking, melt the butter in a small pan over medium heat, add the garlic, and cook, watching continuously, until the butter turns golden-brown and smells of hazelnut — burro nocciola — because it is this colour and fragrance, not pale melted butter, that gives the dish its defining savour. Pale, unbrowned butter produces an inferior result; butter that blackens is discarded and begun again.
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5
Lift the pasta, potato, and cabbage together from the pot with a slotted spoon, retaining the cooking water in case the dish needs loosening, and transfer to a warmed deep bowl or serving dish. Build the preparation in layers — pasta and vegetables, then thin slices of Casera or Bitto, then pasta and vegetables again, then cheese — so the heat of each layer of pasta begins to soften the cheese from below before the butter ever arrives. The cheese layers should be visibly white against the grey-brown pasta.
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6
Pour the brown garlic butter immediately over the surface of the assembled dish so its residual heat continues melting the cheese as it is carried to the table. Serve at once, without mixing. The preparation cools and stiffens rapidly; it is ready when the cheese is visibly melting and the butter is still sizzling faintly as it reaches the table.