1) Start preparing the lasagna by washing the leaves of cabbage, scald them in water boil salted for a few seconds and cool them in cold water; then drain them in a colander, transfer them to a cloth, dry them and remove the hardest part of the central rib. Grate the fontina with a wide hole grater. Coarsely chop i walnut kernels.

2) Prepare the bechamel. In a saucepan, melt the butter, join the flour all at once, mix and then add the milk warm, continuing to mix. Salt, pepper, scented with nutmeg and cook until you get a creamy consistency. Turn off, cover and set aside.

3) Grease a 21×28 cm baking dish and cover it completely with part of the cabbage leaves. Roll out 2-3 slices of Ham, 1/4 of the grated fontina cheese, a layer of bechamel and 1/4 of the walnut kernels chopped up. Repeat the layers 3 more times (cabbage, ham, fontina, béchamel and kernels) and complete with the parmesan and a few bows of butter.

4) Bake the lasagna at 180 ° for about 25 minutes until the surface is golden. If you want a crisper surface, turn on the grill in the last few minutes. Remove from the oven, let the lasagna rest for 10 minutes and serve.