INGREDIENTS
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1 1/4 cups all-purpose flour, plus more for dusting
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1/4 cup sugar
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1 teaspoon finely grated lemon zest
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1/4 teaspoon salt
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1 stick cold unsalted butter, cut into 1/2-inch pieces
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1 large egg yolk
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Cooking spray
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1/2 cup sugar
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4 large egg yolks
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3 tablespoons cornstarch
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Pinch of salt
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1 1/2 cups whole milk
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2 tablespoons unsalted butter
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1 teaspoon vanilla extract
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1/2 cup cold heavy cream
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1 tablespoon poppy seeds