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Preheat the Oven: Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper.
Sauté the Leeks: Heat olive oil and butter in a skillet over medium heat. Add the sliced leeks and sauté for 5-6 minutes until soft. Season with salt, pepper, and lemon zest. Remove from heat.
Prepare the Puff Pastry: Roll out the puff pastry and cut it into two pieces. Place one piece on the prepared baking sheet.
Season the Salmon: Season the salmon fillets with salt, pepper, and parsley. Place them in the center of the pastry.
Assemble the Dish: Spread a spoonful of crème fraîche or sour cream on top of each salmon fillet. Add the sautéed leeks on top of the crème fraîche.
Seal and Bake: Place the second sheet of puff pastry over the filling and press the edges to seal. Make a few slits on top to allow steam to escape.
Egg Wash: Brush the top of the pastry with a beaten egg for a golden finish.
Bake: Bake for 20-25 minutes, or until the pastry is golden and the salmon is cooked through.
Serve: Slice and serve warm with a sprinkle of fresh parsley on top.
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