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1
Combine the flour and salt on a work surface. Add the warm water gradually, working the dough until smooth and cohesive. It will be firmer and slightly denser than an egg-based dough. Knead for 8–10 minutes. Wrap and rest at room temperature for 30 minutes. The dough is ready when it is supple and does not spring back when pressed.
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2
Mix the mashed potato, chopped spinach, drained sultanas, candied lemon peel, cinnamon, and nutmeg in a bowl. Season with a pinch of salt. Mix cold. Taste: the filling should register as unusual-savoury — a perceptible sweetness and warmth from the spice, but emphatically not confectionery. Adjust spice if needed, but do not push the sweetness further.
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3
Roll the rested dough to a thickness slightly greater than Emilian egg pasta — approximately 2–3 mm. Cut rounds of 7–8 cm diameter. Place a small amount of filling (no more than one level teaspoon) at the centre of each round. This is where the dish lives or dies: overfilling collapses the balance of the dish, and the rich sweet mixture must remain a restrained counterpoint, not the dominant mass. Fold each round into a half-moon, pressing the edges firmly to seal without air pockets.
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4
Cook the cjarsòns in a large pan of generously salted boiling water in batches. They are done when they float and the dough at the sealed edge is just tender to the bite — 3–4 minutes from the surface.
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5
While the pasta cooks, melt the butter in a wide, pale-coloured pan over a medium flame. Continue cooking, swirling frequently, until the milk solids turn golden and the kitchen smells of hazelnut. Remove from the heat immediately. The colour must be noisette — amber-gold, not brown-black; the scent is nutty, not bitter.
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6
Lift the cjarsòns from the water with a slotted spoon and transfer directly into the beurre noisette. Turn gently to coat. Divide among warmed plates. Grate the ricotta affumicata generously over each portion — it should fall in fine, dry shards, not clumps. Finish with a light dusting of ground cinnamon. Serve at once: the smoke of the ricotta against the spiced sweet filling should be the first thing perceived on the palate.