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Whisk together the cornstarch and sugar.
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Combine the rhubarb and strawberries in a bowl.
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Toss with the lemon juice. Then toss with the sugar-cornstarch mixture.
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Let stand for 20 minutes.
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Preheat the oven to 350F
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Line 2 baking sheet with parchment paper.
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Roll out the puff pastry sheet on a lightly floured surface. Transfer to one of the baking sheets.
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Sprinkle the breadcrumbs down the middle of the puff pastry sheet.
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Distribute the strawberry rhubarb filling evenly on top.
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Bring the long ends of the pastry sheet together and seal with your fingers.
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Place the second baking sheet on top and flip the strudel onto the second baking sheet.
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Set aside the first baking sheet and parchment paper.
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Brush the strudel with beaten egg.
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Bake for 30 minutes.
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Let cool completely. Transfer to a baking rack and position it over the parchment-lined baking sheet.
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Whisk together the powdered sugar, milk, and jam until smooth.
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Pour the glaze over the top of the strudel.
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Transfer to a platter. Cut with a serrated knife and serve.