"We made spice cake rather than the yellow cake typical of upside-down cakes. In place of grapefruit, you can use apricots, peaches, or plums in summer, and apples or pears in fall...."
INGREDIENTS
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10 tablespoons (1 1/4 sticks) unsalted butter
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3/4 cup packed light-brown sugar
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2 small pink grapefruit
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1 1/2 cups flour
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1 1/2 teaspoons baking powder
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1 teaspoon ground cinnamon
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3/4 teaspoon ground ginger
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1/2 teaspoon baking soda
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1/4 teaspoon ground allspice
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1/2 cup granulated sugar
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2 large eggs
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1 teaspoon vanilla extract
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1/2 cup milk
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Whipped cream, (optional)