Soak rolls in water. Peel onions, finely dice 1 onion. Peel, wash and halve the potatoes. Quarter pumpkin, peel, core and dice. Peel garlic and dice coarsely. Cook potatoes, garlic and pumpkin in boiling salted water for about 25 minutes
In the meantime, squeeze the buns. Knead minced meat, bread roll, egg, diced onion, mustard, 1 teaspoon salt and pepper. Form 8 meatballs with wet hands. Heat the oil in a large pan and fry the meatballs for 3-4 minutes on each side
Peel the apples, cut out the core with a core cutter. Cut apples into slices. Cut 2 onions into rings. Wash parsley, shake dry and cut finely
Remove the meatballs from the pan and keep warm. Put clarified butter into the pan, heat it up, fry the onion rings in it until golden brown while turning, add apples shortly before the end of the frying time and fry them for a short time
Drain the potato and pumpkin vegetables and mash them coarsely with a potato masher, adding olive oil. Season to taste with salt, nutmeg and lemon juice. Arrange pumpkin-potato puree, meatballs, apple and onion rings on plates. Sprinkle with parsley