Onions peel, quarter and in fine slices cut. Dab meat dry, possibly cut a little smaller. Heat the oil in a roasting pan and fry the meat thoroughly. Add onions and thyme and fry for 1-2 minutes. Season with salt and pepper.
Add white wine and 500 ml water. Bring to the boil, stir in broth and mustard. Cover and cook for about 1 1/2 hours. Prepare rice in boiling salted water according to package instructions. Drain cucumber and beetroot. Cut cucumber into slices, beetroot first into slices, then into wide sticks. Mix sour cream and flour. Stir the mixture into the goulash, bring to the boil and simmer for 5 minutes. Mix in cucumber and beetroot, season with salt and pepper. Drain rice, let drain.
Cut cucumber into slices, beetroot first into slices, then into wide sticks. Mix sour cream and flour. Stir the mixture into the goulash, bring to the boil and simmer for 5 minutes. Mix in cucumber and beetroot, season with salt and pepper. Drain rice, let drain. Serve together with the goulash. Garnish with thyme