For the recipe of cinnamon-flavored fennel, cool the milk, flavored with a teaspoon of cinnamon and a pinch of salt. Separate 40 g of butter and mix in the flour, stirring with a whisk, away from the heat. Add the mixture to the flavored milk and cook for 5 minutes, continuing to stir.
For the fennel: Peel the fennel and cut it into slices half a cm thick; Scald them in boiling salted water and acidulate with the juice of half a lemon for 8-9 minutes. Drain and cool them. Grease a baking dish, spread a few spoonfuls of béchamel on the bottom, then make a first layer of fennel slices; sprinkle with bechamel and grated cheese. Make other layers until the fennel is exhausted, finishing with béchamel and grated parmesan.
Bake at 200 ° C in grill mode for 12-13 minutes. Garnish with a little grated orange peel and serve.