INGREDIENTS
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* 6 tablespoons butter
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* 2/3 cup granulated sugar
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* 4 egg yolks
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* 1 1/4 cups flour
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* 1 1/2 teaspoons baking powder
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* 1/8 teaspoon salt
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* 1/3 cup milk
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* 2 teaspoons finely grated lemon peel
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* 2 teaspoons lemon juice
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* 1/2 teaspoon vanilla extract