INGREDIENTS
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½ cup + 6 Tbsp Unsalted Butter, at room temperature
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3 cups + 3 Tbsp All Purpose Flour
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1 cup Superfine Sugar
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1 Large Egg, lightly beaten
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1 tsp Vanilla Extract
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Royal icing:
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2½ – 3 cups powdered sugar, unsifted
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2 large egg whites
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2 tsp lemon juice