Season the salmon fillet with pepper, salt, and grated horseradish. Drizzle with olive oil. Place the salmon in the air fryer and cook for 10 minutes at 185°C. If your appliance has a SteamFry or steam function, you can use it here.
Peel the white asparagus from just below the tip downwards and trim off the tough ends. For green asparagus, you only need to remove the tough bottom part. Mix them with a little olive oil, pepper, and salt.
Bake the asparagus for 10 minutes at 180°C in the air fryer until lightly roasted but still a bit firm.
Carefully pull the cooked salmon into large pieces. Cut the asparagus into pieces and set aside a few nice asparagus tips for garnish.
For the sauce, put the mascarpone, cream, garlic, wild garlic, pepper, and salt in a tall measuring cup. Blend until smooth with an immersion blender to a creamy sauce. If the sauce is very thick, let the cream come to room temperature first.
First, spread a layer of sauce in an oven dish or air fryer baking accessory. Layer with lasagna sheets, then asparagus, pieces of salmon, and sauce again. Repeat the layers until everything is used up.
Finish with a final layer of sauce and sprinkle with grated Emmentaler cheese.
Bake the lasagna for approximately 25 minutes at 185°C in the air fryer until the cheese is golden brown and the lasagna sheets are cooked through. Again, use a SteamFry or steam function if your appliance has one.
Garnish with the reserved asparagus tips, some extra sauce, and optionally some finely chopped wild garlic.