Wash the gooseberries, remove the stems, and sprinkle with lemon juice to enhance their fresh flavor.
In a bowl, combine the gooseberries with the sugar and vanilla sugar. Let it sit for a few minutes to allow the flavors to meld.
On a lightly floured surface, unfold the puff pastry and roll it out thinly.
Sprinkle breadcrumbs over the center of the pastry to absorb the gooseberry juices during baking. Evenly distribute the gooseberry filling over the breadcrumbs.
Fold the edges of the pastry over the filling, then turn it over so the seam is on the bottom. Brush the top with beaten egg.
Preheat the oven to 350°F (180°C) and bake the strudel for 25-30 minutes, or until golden brown.
Let it cool slightly before slicing. Dust with powdered sugar and serve.
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