Clean and wash the leek and cut into coarse rings. Steam in hot fat for about 5 minutes. Dust with flour and sweat briefly. Stir in 1/2 l water, milk and stock. Bring to the boil and simmer for about 5 minutes. Grate cheese. Melt 2/3 in the sauce. Season the sauce with pepper and salt if necessary
Place 1 slice of ham around 1 slice of bread. Layer bread and sauce in a greased casserole dish. Sprinkle with remaining cheese
Bake in the preheated oven (electric cooker: 200 °C/recirculating air: 175 °C/gas: level 3) for 15-18 minutes. Wash parsley and chop finely. Roast sunflower seeds in a pan without fat. Sprinkle both over the casserole