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Peel the rhubarb if needed and cut into small thin slices. Slice the strawberries as well.
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In a bowl, mix the cream cheese, egg yolk, vanilla pudding powder or cornstarch, sugar, lemon zest, and lemon juice until smooth and creamy.
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Preheat the oven to 400°F / 200°C conventional bake. Line a baking sheet with parchment paper.
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Roll out the puff pastry and cut into 8 equal rectangles.
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Using a knife, lightly score a border about 1/4 inch around each rectangle, making sure not to cut all the way through.
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Brush the borders with egg yolk.
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Spread a spoonful of the cream cheese filling inside the border of each pastry. Add a small spoonful of jam on top, then arrange the strawberries and rhubarb over the filling.
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Sprinkle the pastry edges with pistachios and a little vanilla sugar.
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Bake for about 20 minutes or until deeply golden, puffed, and crisp.
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Let cool slightly and dust generously with powdered sugar before serving.
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Because if you’re making puff pastry danishes at home, subtlety is no longer necessary.