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1
Soak the raisins in warm water for 10 minutes, then drain, so they plump and lose the sharpness that would otherwise spike through the finished sauce. Toast the pine nuts in a dry pan over medium heat, moving them constantly, until evenly golden — they scorch without warning the moment they are left alone. Bloom the saffron in 3 tablespoons of warm water and reserve off the heat; the preparations are ready when the pine nuts are uniformly pale gold and the saffron liquid is a deep amber.
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2
Warm the olive oil in a wide pan over medium heat, add the sliced onion, and cook gently until softened and translucent, so its raw sharpness mellows into sweetness before anything else enters the pan. Add the anchovy fillets and press them into the oil, working them until they dissolve entirely and the base smells savoury rather than fishy. Add the wild fennel fronds and stir to combine; the pan is ready when the anchovies have disappeared into the base and the fennel is fragrant.
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3
Raise the heat to high and add the cleaned sardines to the pan without disturbing them for 3 minutes, so the cut surfaces form a proper golden crust rather than steaming and falling apart. Turn them once and cook a further minute. The sardines are ready when those cut surfaces show a deep golden crust.
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4
Reduce the heat to medium and fold in the drained raisins and toasted pine nuts, turning them through the pan once so they take on the fragrance of the sardine base. Remove the pan from the heat entirely, then add the bloomed saffron liquid and stir once to distribute — the saffron must meet the sauce off the heat, or its honeyed perfume, which defines the dish, will cook off before the pasta is even dressed. This is where the dish lives or dies.
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5
Cook the pasta in well-salted boiling water until two minutes short of al dente, because it will finish in the oven and must not turn soft before it gets there. Drain, reserving a ladleful of pasta water, and fold the pasta through the sauce, loosening with the reserved water as needed so the starchy liquid helps the sauce cling rather than slide off. The pasta should be evenly coated but the sauce should not pool.
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6
Transfer the dressed pasta to a terracotta baking dish and scatter the muddica atturrata evenly across the surface, so every portion gets the textural contrast the Palermitana tradition depends on. Cover tightly with foil and bake at 200 °C for 20 minutes, then remove the foil and bake uncovered for a further 10 minutes so the breadcrumbs crisp and the exposed pasta takes colour. The dish is done when the pasta at the edges and surface has caramelised to a deep golden crust and the breadcrumbs are crisp.