Wash the potatoes and cook covered in boiling water for about 20 minutes. Drain potatoes, rinse, peel and halve. Clean and wash the beans and cook for 15-20 minutes in boiling salted water.
Melt the fat in a pot. Sweat flour in it. Deglaze with broth and milk. Season to taste with salt, pepper and nutmeg. Cut Leberkäse into large cubes and fry briefly in hot oil. Fill potatoes, beans and Leberkäse into an ovenproof dish.
Pour gravy over it. Sprinkle cheese over it. Bake in a preheated oven (electric range: 200 °C/ gas: level 3) until golden brown. Serve sprinkled with parsley.