INGREDIENTS
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Pastry for a double-crust pie (9 inches)
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5 cups thinly sliced peeled tart apples (about 5 medium)
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1 pint fresh blackberries, rinsed and drained
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1 tablespoon lemon juice
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3/4 cup sugar
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2 tablespoons cornstarch
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2 tablespoons butter
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1 egg, lightly beaten
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1 tablespoon water or milk