Wash the pumpkin, remove seeds and wadded fibres. Cut pumpkin into thin slices. Onions peel, halve and cut into slices. Sort spinach, wash and drain. Chop nuts coarsely.
Peel, wash and chop the potatoes. Peel and quarter apples, remove core. Cover potatoes and apples and cook in boiling salted water for about 20 minutes.
Preheat oven (electric cooker: 200 °C/circulating air: 180 °C/gas: see manufacturer). Wash meat, pat dry, season with salt and pepper. Roast nuts in a large ovenproof pan (with lid) or a flat roaster, remove. Fry the bacon in the pan until crispy and take it out. Fry the meat in the bacon fat on each side, also remove. Fry the pumpkin and onions in the frying fat for about 2 minutes. Fold in spinach. Season to taste with salt, pepper, nutmeg and cinnamon. Put the meat on the vegetables, pour 150 ml water on it and bring to the boil. Cover and braise in a hot oven for 15-20 minutes. In the last 2 minutes remove the lid and heat the bacon on the meat again briefly.
Drain the potatoes and apples. Add butter and milk. Mash coarsely with a potato masher. Season to taste with salt and nutmeg. Arrange meat, vegetables, bacon and mashed potatoes. Sprinkle with nuts.