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1
Place the pancetta cubes in a cold, dry pan. Set over a medium-low flame and render until the fat is translucent and the cubes are beginning to colour at the edges. No oil is added: the pancetta provides its own fat, and any addition dilutes the flavour. The pan is ready when the fat pools clearly around the meat and carries a faint rosemary fragrance.
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2
Add the whole garlic clove and the dried peperoncino to the rendered fat. Cook for 30 seconds, moving the clove once. The garlic should turn pale gold at the base; it must not brown.
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3
Add the crushed peeled tomatoes. Stir to combine with the pork fat. Simmer uncovered over a moderate flame for 20–25 minutes. This is where the dish lives or dies: the sauce must reduce until it is dense and a thin skim of orange-red fat has separated visibly to the surface — this separation is correct and signals adequate reduction; a sauce that has not reached this point is thin, acidic, and will slide off the pasta. Remove and discard the garlic clove. If using a basil leaf, add it in the final minute. Season with salt.
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4
Cook the pasta in generously salted boiling water until al dente. Reserve a ladleful of the pasta cooking water before draining. Drain the pasta.
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5
Transfer the drained pasta directly into the pan of sauce. Add a small splash of the reserved pasta water. Stir vigorously over the heat for 60 seconds. The pasta water binds sauce to pasta; every ridge should be coated and the sauce should not pool at the base of the pan.
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6
Plate immediately. Grate Pecorino Molisano over each portion with generosity — the cheese is not a garnish but a structural element, contributing body and saltiness to the finished dish. The Pecorino should begin to melt into the sauce on contact.