Peel, wash and quarter the potatoes and boil them in salted water for about 20 minutes. In the meantime wash and dry apples. Quarter 1 apple, remove seeds and cut into fine cubes. Cut 4 slices off the other apple.
Core the rest and also dice finely. Sprinkle everything with lemon juice. Heat 1 tablespoon butter in a pan and sauté apples in it. Put slices aside for garnishing. Soak toast in cold water.
In the meantime peel and finely dice the onion. Knead squeezed toast, egg, mustard, tomato paste and minced meat. Season with salt and pepper. Wash marjoram and dab dry. Pluck the leaves from the stalks, except for some for garnishing.
Add to the minced meat mixture and knead. Form 8 minced steaks from the mincing mixture. Heat the oil in a grill pan and fry the steaks for about 8 minutes on each side. In the meantime heat milk and 2 tablespoons of butter.
Drain the potatoes. Mash them with a potato masher. Stir in hot milk. Season with salt and nutmeg. Fold in diced apples, except some for garnishing. Arrange apple-potato puree and minced steaks on plates.
Garnish with apple slices, marjoram and apple cubes.