INGREDIENTS
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tablespoons butter, room temperature
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loaf challah bread, cut into 1/2-inch thick slices
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large eggs, beaten well
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cups whole milk
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cups heavy cream
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cup sugar
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tablespoon poppy seeds
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tablespoon finely grated lemon zest
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teaspoon kosher salt
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cups confectioners’ sugar
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teaspoons lemon juice
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cups blueberries