| • | Heat oven to 375 degrees F.
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| • | Grease a nine-inch tube pan.
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| • | Beat the egg whites in a bowl and leave aside.
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| • | Cream the butter with sugar in a large bowl.
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| • | Beat egg yolks and the lemon zest. Add it to the butter mixture.
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| • | Stir together 1-cup flour and baking powder.
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| • | Fold in this flour mixture into the creamed mixture.
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| • | Add and stir the egg whites.
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| • | Arrange the batter uniformly into the prepared pan.
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| • | Arrange the sliced plums attractively over the batter with skin-side down.
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| • | Bake it for 40 minutes at 375 degrees F.
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| • | Remove and cool on a rack.
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| • | Plum Cake is ready. |
