Tend the fillet, then fry all over in 2 tablespoons of oil
and keep warm.
Peel and dice the onion and garlic and sauté in oil, then mix with crème fraîche, camembert and breadcrumbs to a smooth mass. Finely chop the parsley and add 2/3. Season to taste with salt and pepper.
Place a sufficiently large sheet of puff pastry on a baking sheet, place the fillet on it, then spread the cheese mixture on top and cover with the remaining puff pastry. Bake in a preheated oven for 20 minutes at 200 degrees until golden brown.
In the meantime, peel and dice a small onion and sauté in the remaining oil. Add the chanterelles and cook with them. Add the crème fraîche and simmer for a few minutes. Finally fold in the remaining parsley.