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1
In food processor, pulse flour and sugar until combined. Add 4 pieces butter and pulse until incorporated. Continue adding several pieces butter and pulsing until all butter is incorporated and mixture resembles coarse meal with some small (roughly pea-size) butter lumps. Transfer to medium bowl and chill 30 minutes.
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2
Preheat oven to 375u00b0F. Butter and flour 9- by 13-inch glass baking dish.
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3
In medium bowl, whisk together flour, baking powder, and salt. In medium bowl, whisk together melted butter and wine.
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4
In bowl of electric mixer fitted with paddle attachment, beat together eggs, sugar, and vanilla on medium speed until light and fluffy, about 2 minutes. Reduce speed to low and beat in flour and butter mixtures alternately in batches, beginning and ending with flour mixture, for 5 batches total.
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5
Pour batter into prepared pan and top with blackberries, then cover with crumb topping, pressing down lightly to seal in blackberries. Bake slump until top is golden brown, about 1 1/2 hours. Transfer to rack and cool 20 minutes. While still slightly warm, spoon into individual bowls and top with vanilla ice cream.
