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1
To make Ginger-Yogurt Topping: Line sieve or colander with cheesecloth, and set over bowl.
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Spoon yogurt into sieve, cover and let drain in refrigerator at least 30 minutes.
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3
Discard liquid.
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Put drained yogurt and minced ginger in bowl, and stir well.
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Set aside.
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6
To make Spiced Mango Upside-Down Cake: Preheat oven to 375F.
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Put oven rack on lowest position.
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Spray 10-inch cast-iron skillet or 9-inch cake pan with nonstick cooking spray.
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Sprinkle pan with brown sugar.
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Using back of spoon, press sugar evenly over bottom of pan.
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Arrange drained mango slices, round side down, on sugar.
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12
Put whole wheat flour, all-purpose flour, baking powder, baking soda, salt, nutmeg and ginger in mixing bowl, and whisk until blended.
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Put eggs and granulated sugar in separate bowl, and whisk until smooth.
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Add oil and yogurt, and whisk until smooth.
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Beat in vanilla.
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With rubber spatula, fold flour mixture in fourths into yogurt mixture.
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Pour batter over mango slices in pan; spread evenly.
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Bake 30 to 35 minutes, or until top is golden and cake starts to pull away from sides.
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Immediately loosen edges with knife.
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Place serving platter over skillet, then invert skillet and platter; remove skillet.
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Replace any mango slices still in skillet.
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Cool at least 20 minutes before serving.
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Serve warm or at room temperature with Ginger-Yogurt Topping.
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Garnish with crystallized ginger, if desired.