"A classic tender cookie from famous Italian Floating City!..."
INGREDIENTS
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3 large egg yolks, room temperature
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1/2 cup granulated sugar
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1/2 teaspoon rum (for a no-alcohol version use 1/2 teaspoon rum, almond, or orange extract)
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1 teaspoon lemon zest
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2 cups all-purpose flour
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7 tablespoons butter, room temperature
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1 large egg white, lightly beaten