Onions peel and roughly chop. Peppers clean, wash and roughly dice. Heat the oil in a large casserole, add the meat and fry thoroughly, turning it all around. Then add onions, paprika and bay leaf and fry again while turning.
Add tomato paste and stir in. Season with salt, pepper and paprika. Deglaze with 500 ml water and broth. Bring to the boil, cover and stew over medium heat for about 1 3/4 hours. Add the wine 15 minutes before the end of the stewing time.
In the meantime wash parsley, dab dry and chop finely. Stir sour cream and flour until smooth. Stir into the goulash, bring to the boil, season again with salt, pepper, sugar and paprika. Sprinkle with parsley and serve garnished with parsley leaves as desired.