INGREDIENTS
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1 tablespoon butter, melted
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1 tablespoon white sugar
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5 teaspoons butter, melted
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5 teaspoons all-purpose flour
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1/4 cup cold milk
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2 egg yolks
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1 teaspoon freshly grated orange zest
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1 tablespoon brandy-based orange liqueur (such as Grand Marnier®)
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1/8 teaspoon vanilla extract
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2 egg whites
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1/4 cup white sugar, divided