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Preheat oven to 350°F.
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To make crust, mix flour, sugar, and lemon rind.
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Cut in butter until mixture resembles coarse crumbs.
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Add egg yolk and 1 T of milk; mix gently to form a dough.
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Pat into bottom of a 10-inch Springform pan that has sides only greased.
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Press dough up sides of pan for 1 inch.
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For the Filling:.
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Warm the raisins over low heat in the rum.
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Toss together bread crumbs and melted butter and spread evenly over pastry crust.
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Toss apple slices,lemon juice, and 1/4 c of sugar together and spread apples over crumbs.
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Drain raisins, reserving rum, and sprinkle raisins over apples.
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Bake for 15 minutes.
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For the topping:.
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While the cake is baking for the initial fifteen minutes, beat eggs and sugar until thick and lemon-colored.
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Stir in milk and reserved rum.
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Pour custard over apples and return to oven.
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Bake for 45 to 60 minutes until custard is set.
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Cool completely before serving.
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Do NOT remove springform pan until cool; do run thin sharp knife around inside of pan before removing.