INGREDIENTS
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Unsalted butter, room temperature, for ramekins
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1 3/4 cups grapefruit juice (from about 3 red grapefruits)
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1 tablepoon finely grated fresh ginger
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1/2 cup granulated sugar, plus more for dusting
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1 teaspoon finely grated red-grapefruit zest
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5 large egg yolks, room temperature
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2 tablespoons cornstarch
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2 tablespoons all-purpose flour
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1/4 cup plus 2 tablespoons Greek yogurt
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9 large egg whites, room temperature
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Pinch of coarse salt
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Pinch of cream of tartar
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Confectioners' sugar, for dusting