Onions peel, halve and cut the halves into slices. Heat oil in a pot, add onions and braise for 8-10 minutes while turning over medium heat. Sprinkle with flour, sauté and deglaze with stock.
Bring to the boil and simmer for about 7 minutes at low heat. In the meantime cut the cabanossi into slices. Wash parsley, dab dry and chop finely. Add cheese, cabanossi and wine, bring to the boil again and season the soup with salt, pepper, cumin and sugar.
Serve the soup sprinkled with parsley.