Cut the fish fillets into smaller pieces as desired, brush with oil, season with salt and pepper, place them next to each other on a baking sheet covered with baking paper.
Dice shallots and roast them together with the sliced almonds in a little oil until golden brown. Add the mushrooms and cook until the liquid has evaporated. Season with salt, freshly ground pepper and a little lemon juice.
Allow to cool a little, mix with the egg yolk, ground almonds, chopped parsley and parmesan. The consistency can be adjusted to taste with another egg yolk, a little oil or ground almonds.
Spread the mushroom mixture over the fish fillets and shape into closed hoods with your hands.
Bake at 175 ° C for about 20 minutes (shorter or longer depending on the thickness of the fillets) until the top is lightly browned.
Potatoes, rice or tagliatelle go well with it. I served it with potato tree cake and saffron foam.