"This cake is truly magic. You make just one batter, but after baking you end up with three distinct layers of cake, fruit and custard...."
INGREDIENTS
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6 tablespoons unsalted butter
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3 large eggs, at room temperature, separated
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3/4 cup granulated sugar
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2/3 cup all-purpose flour (see Cook's Note)
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1/8 teaspoon fine salt
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1 1/2 cups milk
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1 teaspoon vanilla extract
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1 cup strawberries, sliced 1/4 inch thick
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1 cup raspberries, halved lengthwise
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1/2 teaspoon cream of tartar
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Confectioners' sugar, for serving
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Whipped cream, for serving