INGREDIENTS
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1 1/4 cups all-purpose flour
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1 tablespoon sugar
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1/2 lemon, zested
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Pinch kosher salt
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1 1/4 cups milk
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1 egg
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2 tablespoons butter, melted, divided
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2/3 cup blueberry jam or preserves
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1/2 lemon, juiced
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2 tablespoons sugar
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2 teaspoons cornstarch
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Pinch kosher salt
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3/4 cup milk
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1 egg yolk
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1 teaspoon vanilla extract
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3 tablespoons confectioners' sugar, for garnish