Preheat oven to 350 degrees F (180 degrees C).
Wash Fennel Bulb (1 kilogram), and remove external leaves and cut each bulb into wedges.
In a skillet melt Butter (2 tablespoon) add the fennel and cook on each side for about 5-6 minutes or until they get a nice golden color. Season with Salt and Pepper (to taste) and remove from the heat.
Rub the remaining butter on a baking tray, lay all the fennel into one single layer.
Cover with Bechamel Sauce (500 milliliter) and Grated Parmesan Cheese (1/3 cup).
Bake in the preheated oven for 20 minutes or until cooked and a nice crust as formed on top.