Wash and clean the broccoli, cut the florets from the stalk and cut into 1 cm thick slices. Melt the fat in a pot. Stir in flour, sweat briefly. Slowly stir in milk and stock and let it simmer for about 5 minutes, stirring occasionally.
Season with salt and pepper.
Set aside 1/4 of the sauce. Add broccoli to the remaining hot sauce. Cut ham into large cubes. Grate cheese. Put half of the broccoli mixture into an ovenproof dish (approx. 24 x 34 cm).
Then alternately layer 4 lasagne plates, broccoli mixture and ham. Pour the sauce that has been set aside over the top layer of pasta and sprinkle with cheese. In the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see
manufacturer) bake for about 25 minutes.