Ingredients

• 2/3 cup chilled buttermilk
• 1 large chilled egg
• 1 teaspoon vanilla extract
• 2 cups cake flour
• 1/4 cup sugar
• 1 tablespoon baking powder
• 1/2 teaspoon salt
• 1/2 cup chilled unsalted butter, cut into 1/2-inch pieces
• 5 medium plums, pitted, cut into 1/2-inch pieces
• 2 large peaches, pitted, cut into 1/2-inch pieces
• 1 1/2-pint basket raspberries
• 1/3 cup sugar
• 1 8-ounce container chilled mascarpone cheese, or one 8-ounce package cream cheese at room temperature
• 1 cup chilled whipping cream
• 1/4 cup powdered sugar
• 1 teaspoon vanilla extract
• Additional powdered sugar

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Instructions

1. Position rack in center of oven and preheat to 425°F. Whisk buttermilk, egg and vanilla extract in medium bowl to blend; transfer 1 tablespoon mixture to small bowl and reserve for glaze. Sift flour, sugar, baking powder and salt into large bowl; add butter. Using electric mixer, beat until mixture resembles coarse meal, about 3 minutes. Add buttermilk mixture and blend just until soft moist dough forms. Turn dough out onto lightly floured surface. Using floured hands, gather dough into ball and knead gently for 6 turns. Transfer dough to ungreased baking sheet. Shape dough into 8-inch round. Brush top with reserved 1 tablespoon buttermilk mixture. Bake cake until top is golden brown and tester inserted into center comes out clean, about 20 minutes. Transfer cake to rack and cool completely.
2. Make filling: Toss plums, peaches, raspberries and 1/3 cup sugar in large bowl to blend. Let stand 30 minutes. Meanwhile, beat mascarpone, whipping cream, 1/4 cup powdered sugar and vanilla in large bowl until firm peaks form. Refrigerate until ready to use. Cut off top 1/3 of cake. Using small knife and leaving 1/2-inch border at edge, cut out enough of cake bottom to form 1/2-inch-deep indentation. Spread half of mascarpone cream in indentation. Using slotted spoon, remove fruit from bowl; mound onto cream. Reserve fruit juices in bowl. Spread remaining mascarpone cream over fruit. Cover with top of cake. Refrigerate cake and reserved juices separately, at least 3 hours and up to 6 hours. Let cake stand at room temperature 30 minutes before serving. Dust with powdered sugar. Cut into wedges. Drizzle with reserved fruit juices and serve.
3. Toss plums, peaches, raspberries and 1/3 cup sugar in large bowl to blend. Let stand 30 minutes.
4. Meanwhile, beat mascarpone, whipping cream, 1/4 cup powdered sugar and vanilla in large bowl until firm peaks form. Refrigerate until ready to use.
5. Cut off top 1/3 of cake. Using small knife and leaving 1/2-inch border at edge, cut out enough of cake bottom to form 1/2-inch-deep indentation. Spread half of mascarpone cream in indentation. Using slotted spoon, remove fruit from bowl; mound onto cream. Reserve fruit juices in bowl. Spread remaining mascarpone cream over fruit. Cover with top of cake. Refrigerate cake and reserved juices separately, at least 3 hours and up to 6 hours.
6. Let cake stand at room temperature 30 minutes before serving. Dust with powdered sugar. Cut into wedges. Drizzle with reserved fruit juices and serve.