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1
Toast rice in a heavy-bottomed pan over medium heat for 2 minutes, stirring constantly, until lightly golden; add saffron-infused stock and milk in stages, stirring frequently until rice is creamy and al dente (approximately 20 minutes).
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2
Remove from heat; fold in 75 g butter and 100 g Parmigiano Reggiano; spread onto a baking tray and cool 30 minutes.
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3
Meanwhile, sauté onion in 25 g butter until soft (3 minutes); add minced meat and brown, breaking apart (5 minutes); deglaze with tomato passata; simmer 10 minutes; fold in peas; season and cool.
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4
With wet hands, form 40 g rice ball; flatten into a 10 cm disc; place 10 g ragù, half an egg yolk, and one mozzarella cube in the centre; fold edges and roll into a smooth ball; repeat for 12 arancini.
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5
Set up three shallow bowls: one with beaten eggs, one with remaining 50 g Parmigiano Reggiano mixed into panko, one empty. Coat each arancino in egg, then panko mixture, pressing gently; rest on a tray 20 minutes.
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6
Heat neutral oil to 165°C; working in batches, fry arancini for 3–4 minutes until deep golden, turning occasionally; drain on paper towels.
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7
Serve immediately while mozzarella is still molten, with lemon wedges or tomato sauce.