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1
In work bowl of stand mixer, cream butter and sugar until there is no granularity left and butter is light and fluffy.
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2
Add eggs, one at a time, beating well after each addition.
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3
Sift flour, baking powder and salt 3 times.
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4
Alternate adding flour and milk to butter, starting and ending with dry ingredients.
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5
Add vanilla and lemon juice, if using.
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6
Pour into a greased and floured loaf pan.
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7
To make marble cake, pour 2/3 of the batter into a greased and floured loaf pan.
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8
Add cocoa powder to the remaining batter and mix until fully blended.
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9
Pour over batter in loaf pan and swirl briefly with a butter knife.
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10
Put into a cold oven and turn temperature up to 350F Bake 1 hr 15 minute Cool in pan 10 minutes, then remove and leave on a cooling rack until fully cooled.
