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1
Cut butter into flour and salt until mixture resembles coarse breadcrumbs; add ice water until dough just comes together.
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2
Form dough into disk, wrap in plastic, and chill 60 minutes.
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3
Toss apples with sugar, cornstarch, lemon juice, cinnamon, nutmeg, and allspice; macerate 15 minutes.
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4
Roll dough to 3mm thickness; line 23cm pie tin, trim overhang to 2cm.
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5
Fill with apple mixture; roll second dough portion, cut into 2cm strips, and weave lattice pattern.
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6
Brush lattice with egg wash; chill 15 minutes.
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7
Bake at 200°C for 50 minutes until crust is deep golden brown.