Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Peel, wash and cut potatoes into thick slices. Mix with 5 tablespoons of oil, salt and pepper. Place on a baking tray and roast in a hot oven for approx. 40 minutes until crispy, turning occasionally.
Wash the meat, dab dry. Heat 2 tablespoons of oil in a large frying pan. Fry the meat on each side for about 7 minutes. Season with salt and pepper.
In the meantime, clean and wash the spring onions and cut them into rings. Wash, quarter and core the apples. Cut apples into slices.
Remove meat from the pan and keep warm. Steam apple slices in hot frying fat for about 5 minutes. After approx. 3 minutes add spring onion rings and stew.
Deglaze with vinegar and about 100 ml water, bring to the boil and simmer briefly. Season sauce with salt, pepper and sugar. Add meat again and let it simmer for a short time. Serve with the baked potatoes.