INGREDIENTS
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Ingredients
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4 cups sliced fresh or frozen rhubarb, thawed
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4 cups boiling water
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1-1/2 cups sugar
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3 tablespoons all-purpose flour
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1 teaspoon quick-cooking tapioca
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1 egg
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2 teaspoons cold water
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Pastry for double-crust pie (9 inches)
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1 tablespoon butter