Cook the wild rice in lightly salted water, then drain and let it cool completely.
Roughly chop the toasted walnuts, and finely chop the parsley.
In a bowl, combine the cooked wild rice, chopped walnuts, crumbled feta cheese, and sour cream.
Season with salt and pepper, then stir in the chopped parsley.
On a lightly floured surface, roll out the puff pastry and cut it into equal-sized triangles.
Place a spoonful of the wild rice filling onto 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 sesame seeds.
Place the croissants on a baking sheet lined with parchment paper, and bake for 20-25 minutes, or until golden brown.
Let the croissants cool for a few minutes before serving warm or at room temperature.
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