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1
Place the beef and pork shoulder in a heavy pot with the carrot, celery, and onion. Add enough water or light stock to cover. Braise, covered, over a low flame until both meats are thoroughly tender and yield without resistance. Remove the meats and vegetables; reserve all braising liquid separately. Allow everything to cool completely — the meats must be cold and firm before processing. The test: the liquid, when chilled, should have set to a light gel.
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2
Pass the cold braised beef, pork, and braised vegetables through a meat grinder or pulse briefly in a food processor to a coarse, cohesive paste — not a smooth purée. Combine with the grated Parmigiano, beaten eggs, and nutmeg. Mix until uniform. The filling must be dry, firm, and hold its shape when pressed; a wet or slack mixture will tear the pasta at sealing. This is where the dish lives or dies: if the filling is warm or wet, no subsequent step recovers it.
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3
Defat the braising liquid thoroughly — skim the surface or lift the solidified fat layer after chilling. Reduce the liquid over a medium flame, stirring occasionally, until it reaches a syrupy, glossy consistency that coats a spoon. If using the Barolo Chinato, add it in the final minutes of reduction. The test: a line drawn through the sugo on the back of a spoon holds clean.
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4
Make the egg pasta: work the flour and eggs to a smooth, elastic dough. Rest, wrapped, for at least 30 minutes. Roll on a pasta machine to setting 7 (the second-thinnest) — the sheet must be thin enough that the filling dominates, not the pasta. The test: the sheet is semi-translucent when held to light.
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5
Lay the pasta sheet flat. Place mounds of filling at regular intervals. Brush egg wash precisely around each mound's perimeter. Fold the sheet over or lay a second sheet on top. Press firmly outward from each mound with fingertips to expel all trapped air before cutting the squares. The test: each sealed raviolo is flat against the board with no visible air pocket; any bubble is re-pressed or discarded.
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6
Cook the ravioli in abundant salted boiling water. They are done when they rise to the surface and the pasta, tested at the sealed edge, offers no raw resistance — 2 to 3 minutes for pasta at setting 7. Remove with a slotted spoon.
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7
Dress immediately and generously with the warm sugo d'arrosto — the braising liquid is the sauce; no other sauce is appropriate to this dish. The test: the ravioli are glossy and evenly coated, not pooled in liquid and not dry.