Cut the sausages into pieces. Clean, wash and dice the peppers. Cut open chilli pepper, remove stalk and seeds. Cut the pod into pieces. Peel onions and cut into rings.
Clean the mushrooms, wash and halve them. Peel and wash the potatoes and cook in boiling salted water for about 20 minutes. Heat the oil in a large pan. Fry sausages, peppers, onions and mushrooms for 3-4 minutes.
Deglaze with tomatoes and add cumin. Simmer gently for about 5 minutes, chopping the tomatoes with a spatula. In the meantime wash and dry the marjoram. Remove coarse stalks.
Pluck marjoram roughly small. Melt butter in a pot. Briefly toss the potatoes and marjoram in it. Season with salt and pepper if necessary. Season goulash with salt, pepper and sugar. Arrange potatoes and goulash on plates.