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1
Warm 4 tbsp olive oil in a wide, heavy saucepan over medium-low heat. Add the sliced onion, bay leaves and crumbled peperoncino. Cook gently, stirring occasionally, until the onion is completely soft and translucent — it must not colour.
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2
Add the crushed tomatoes. Season with salt. Raise the heat briefly until the sauce begins to bubble, then reduce to a low simmer. Cook uncovered for 45 minutes, stirring occasionally, until the sauce is dense, dark in colour and the raw tomato smell has given way to a sweet, concentrated aroma. The sauce must be fully developed before any meatball enters it.
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3
While the sauce cooks, make the polpette mixture. In a bowl, combine the lamb mince, squeezed bread, beaten egg, 40 g grated Pecorino, chopped parsley and nutmeg. Mix with your hands until fully homogeneous. The mixture should hold its shape when pressed but remain slightly tacky.
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4
With cold-wet hands, roll the mixture into balls of approximately 2 cm diameter — small enough that they will cook through reliably. Set them on a tray in a single layer. This is where the dish lives or dies: each polpetta must be rolled very small and with a smooth, uncracked surface so that it forms an intact crust when fried and does not break apart in the sauce.
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5
Heat 4 tbsp olive oil in a wide frying pan over medium-high heat. Fry the polpette in batches, turning them to colour on all sides. When each meatball is uniformly golden-brown and firm to a light press, remove it to a plate. Do not crowd the pan — a full pan will steam rather than fry.
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6
Transfer the fried polpette to the finished tomato sauce. Stir once, gently, to submerge them. Simmer uncovered on a low heat for 20 minutes. At the end, the polpette should feel yielding when pressed with a spoon — they will have absorbed some sauce and become part of it.
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7
Bring a large pot of well-salted water to a rolling boil. Cook the spaghetti alla chitarra until al dente — the pasta should offer slight resistance at the centre when bitten. Drain, reserving a ladleful of pasta water.
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8
Transfer the drained pasta directly to the pan of sauce, away from the polpette. Toss to coat, loosening with a little pasta water if needed, until each strand is evenly dressed and the sauce clings in the chitarra's rough grooves. Serve in warmed bowls with several polpette per portion and a generous grating of Pecorino over the top.