Wash the potatoes and boil in water for about 20 minutes. Quench, peel and let cool down
Peel and finely chop the onion. Steam in hot fat until translucent. Add flour and sauté. Stir in milk, 1/4 l water and stock. Bring to the boil and simmer for about 5 minutes. Roughly dice the gorgonzola and melt in the sauce. Season to taste with salt, pepper and nutmeg
Wash the marjoram and, except for something to garnish, pluck it. Halve the bacon slices lengthwise. Wash the fillet, dab dry and cut into 8 medallions. Cover with 1-2 marjoram leaves each and wrap 1/2 slice of bacon around it. Fry medallions in hot oil for 2-3 minutes on each side. Season with pepper and salt if necessary
Cut the potatoes into slices. Wash the pears, quarter them, remove the seeds and cut them into slices. Layer both with the medallions in a greased casserole dish. Spread sauce over them. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/gas: level 3) for about 20 minutes. Garnish with remaining marjoram