INGREDIENTS
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1 egg yolk
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1/3 cup sugar
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1/4 cup all-purpose flour
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1/4 teaspoon salt
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2 cups milk
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1 tablespoon butter
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1 teaspoon vanilla extract
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1 1/2 cups shredded coconut
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1 (9-inch) prepared graham cracker pie crust
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2 cups frozen whipped topping, thawed