INGREDIENTS
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3 tbs milk
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3 large eggs
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1 1/2 tsp vanilla
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1 1/2 cups sifted cake flour (see NOTES)
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3/4 cup superfine sugar (see NOTES)
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3/4 tsp baking powder
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1/4 tsp salt
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13 tbs unsalted butter, softened
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1-2 tbs grated lemon or orange zest (optional)