When buttermilk biscuit dough gets the jelly roll treatment, this delicious hybrid is the result. The jammy fruit filling is made in the oven, not on the stovetop.

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Ingredients

Directions

  • Preheat oven to 350 degrees. In a bowl, toss rhubarb and berries with 1/3 cup granulated sugar and vanilla. Spread mixture in a single layer on a parchment-lined baking sheet; bake, stirring twice, until juices have thickened but have not burned, 45 to 50 minutes. Immediately transfer to a bowl; let cool completely. (You should have 1 cup. Rhubarb mixture can be refrigerated in an airtight container up to 5 days.)

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  • Increase oven temperature to 400 degrees. Whisk together flour, baking powder, baking soda, remaining 2 tablespoons granulated sugar, and salt. Toss butter in flour mixture to evenly coat, then press between your fingers until mixture has the texture of coarse meal, with a few pea-size pieces remaining. Add buttermilk; stir in with a fork until dough begins to form but mixture is still crumbly. Turn out onto a lightly floured surface; knead just to combine (do not overwork). With a floured rolling pin, roll out to an 8-by-10-inch rectangle, 1/2 inch thick.

  • Spread rhubarb mixture over dough to edges, then fold tightly into thirds like a letter, sealed-side up. Using a large spatula, transfer to a parchment-lined baking sheet. Brush top with buttermilk; sprinkle generously with sanding sugar. Bake until puffed and golden brown, about 40 minutes. Transfer to a wire rack using parchment; let cool about 30 minutes before serving.

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