INGREDIENTS
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5 cups all-purpose flour
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2 teaspoons baking powder
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1/2 teaspoon salt
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1 stick (1/2 cup) unsalted butter, softened
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1/4 cup vegetable shortening
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1 1/2 cups sugar
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2 large eggs
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2/3 cup milk
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1 teaspoon vanilla
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1/2 cup sugar
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2 tablespoons cornstarch
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1/8 teaspoon salt
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1/2 cup water
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1/4 cup milk
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2 large egg yolks
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2 teaspoons unsalted butter
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1/4 cup fresh lemon juice
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1 teaspoon freshly grated lemon zest