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1
Put the flour, salt, and sugar in the bowl of a food processor fitted with a steel blade.
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2
Add the butter or margarine little by little, and pulse until crumbly.
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3
Add 2 tablespoons ice water, and pulse until the dough comes together in a ball, adding a bit more flour if necessary.
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4
Remove the dough, shape it into a disk, wrap in plastic wrap, and refrigerate for at least 30 minutes.
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5
Preheat the oven to 425 degrees, and roll out the chilled dough to a circle about 10 inches in diameter.
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6
Press it evenly into a greased 9-inch tart pan with a removable bottom, bringing the dough up the sides almost to the top of the pan, and keeping an even thickness throughout.
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7
Prick the bottom and sides of the shell with the tines of a fork, and bake for 8 to 10 minutes, or until it is lightly browned.
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8
Remove from the oven, and let cool slightly.
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9
Lower the oven temperature to 400 degrees.
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10
Spread the prepared applesauce in the pie crust, putting the sliced apple in a circular pattern on top.
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11
Return the pie to the oven, and bake for 30 minutes more.