Make lasagna al dente, rinse when cooled, drain and lay out on a dish rack.
Zucchini filling:
Slice zucchini into very thin slices. Cut basil into narrow strips. Mix everything together and season with salt and pepper.
Mushroom stuffing:
Slice mushrooms into narrow slices. Drizzle juice of one lemon over mushrooms. Add parsley, salt and pepper and mix well.
Sauce:
Bring cream to a boil in a frying pan, reduce temperature. Grate cheese and add together with salt, nutmeg and white pepper. Bring sauce to a simmer, stirring with a whisk, until cheese is melted.
Mix one-third of the sauce into the zucchini and one-third into the mushroom filling; set the rest of the sauce aside. Layer in greased baking dish as follows (based on 4 servings):
Bake: about half an hour in the middle of the oven heated to 220 °C.
Our tip: zucchini are tender in taste and therefore good for children.