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1
Drain and rinse all soaked legumes separately. Layer them in the unglazed terracotta pignata in alternating strata: a layer of mixed legumes, then pieces of lard, a dried peperoncino, a garlic clove, and a scattering of wild herbs. Repeat until all ingredients are in the vessel. Add just enough cold water to bring the liquid level to within 3–4 cm of the rim. The vessel is ready when the layers are set and the water level is confirmed.
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2
Work the flour, salt, and lukewarm water into a firm, pliable dough. Roll it into a rope and press it in an unbroken ring around the lip of the pignata, then flatten a disc of dough over the mouth and press the edges down hard against the rope to form a continuous, airtight seal. This is where the dish lives or dies: any gap in the dough seal will allow the internal steam to escape, leaving the legumes under-cooked and their starches un-dissolved. The seal is correct when no joint can be lifted by a fingernail and the surface is smooth and firm to the touch.
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3
Set the oven to 110–120 °C. Place the sealed pignata on the oven floor or a low rack and cook for 8–12 hours, undisturbed. Alternatively, use a slow cooker on its lowest setting for 10–12 hours. Do not break the seal before the minimum time has elapsed. At the end of the cooking period the bread seal will be fully dried and hard to the knock — a hollow sound confirms the steam has done its full work.
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4
Bring the pignata to the table sealed. Break the crust at the rim and lift it away. The interior should release a single, concentrated breath of earthy steam carrying the merged aromas of lard, legume, and peperoncino. The smell is the test: a sharp or raw-bean note means the cooking is incomplete.
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5
Stir the contents with a wooden spoon. The legumes should have dissolved into a single, unified, creamy mass with no distinct whole beans remaining. Taste for seasoning. Serve directly from the vessel, or thin with warm pork broth for a soup. Finish each portion with a drizzle of raw olive oil and a few slices of fresh peperoncino. The texture of a correct pignata is smooth and spreadable — it should hold its shape briefly on a spoon before settling.