For the cannelloni, defrost the spinach leaves and cut into small pieces. Cut the ham into cubes and mix with ricotta together with spinach and parmesan – season with salt and pepper.
Pour the filling into a piping bag and fill the cannelloni with it. Then place them in a greased baking dish.
For the bechamel sauce, heat butter in a saucepan, add flour, stir and pour in milk – season with salt, pepper and nutmeg. Spread sauce evenly on cannelloni.
Grate the Parmesan cheese and sprinkle it on the cannelloni. Bake in the oven at 170 °C for about 30 minutes.