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1
Bloom the saffron in 3 tablespoons of hot water for five minutes. Cook the rice in hot broth, absorbing it gradually as for a risotto, until the grains are tender and the liquid is fully taken up. Remove from heat. Stir in butter, Parmigiano, and the saffron with its soaking water. Every grain must be evenly amber — no pale patches remain.
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2
Spread the rice onto a wide tray in a layer no deeper than 3 cm. Allow to cool to room temperature, then refrigerate uncovered for a minimum of two hours. The rice is ready when it holds a firm indentation under finger pressure without crumbling or sticking.
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3
Prepare the ragù: sweat the onion in a little oil until translucent. Add the minced meat and brown thoroughly. Deglaze with white wine and reduce until the alcohol smell is gone. Add passata and braise on a low heat, stirring occasionally, until the sauce is completely dry — no pooling liquid visible in the pan, the ragù pulls away from the sides cleanly. Fold in the cooked peas. Cool completely before use.
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4
This is where the dish lives or dies. With wet hands, take approximately 80 g of cold rice and press it firmly into a cupped palm to form a base. Place one tablespoon of ragù and two cubes of mozzarella at the centre — no more, or the arancino will crack under frying pressure. Enclose with a further 40 g of rice, pressing firmly and evenly around the filling until the ball (round, Palermo-style) or cone (Catania-style) is seamless and compact under firm hand pressure with no filling visible at the surface.
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5
Set up three shallow dishes in sequence: flour, beaten egg, breadcrumbs. Roll each arancino in flour until fully and evenly coated — shake off any excess. Transfer to the egg wash and turn to coat completely. Roll immediately in breadcrumbs, pressing lightly so the crumbs adhere in an even, unbroken layer. No bare patches of rice should be visible through the coating.
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6
Heat the oil in a deep, heavy pot to 175°C, verified with a thermometer. Lower the arancini in batches of three or four — do not crowd the pot. Fry for four to five minutes, turning once, until the crust is deep amber-gold and shattering-firm to a light tap. Remove and drain briefly on a rack. The crust should sound hollow and dry when tapped, not dull.
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7
Serve immediately. The saffron aroma releases only in the heat; the mozzarella should pull into a molten thread when the arancino is broken open. The interior must be steaming and the crust must remain crisp — not soft — against the lip.