Preheat your oven to 350°F (180°C) and line a baking sheet with parchment paper.
Cut the Camembert cheese into smaller slices to easily fit inside the croissant dough.
Roughly chop the walnuts and mix them with the honey in a bowl.
Roll out the puff pastry on a lightly floured surface, then cut it into equal-sized triangles.
Place a slice of Camembert cheese and a small spoonful of the honey-walnut mixture on the wider end of each triangle.
Carefully roll up the triangles into croissant shapes, starting from the wider end.
Brush the tops of the croissants with the beaten egg, then sprinkle with finely chopped fresh rosemary.
Place the croissants on the prepared baking sheet and bake for 20-25 minutes, or until golden brown.
Let the croissants cool for a few minutes before serving warm or slightly cooled.
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