Wash and clean the cucumber and slice it into thin slices. Peel 1 onion and chop very finely. Mix vinegar and onion. Season with salt and pepper and stir in 2 tablespoons of oil drop by drop. Mix cucumber and salad dressing.
Clean, wash and cut the peppers into strips. Peel 1 onion and cut into slices. Heat 1 tbsp. oil, fry onion and bell pepper for approx. 4 minutes. Season with sugar, salt and pepper.
Stir in the tomato paste. Dust with flour and deglaze with broth while stirring. Bring to the boil and simmer for about 5 minutes, remove from heat and keep warm.
Meanwhile wash the parsley and shake dry. Pluck the leaves from the stems and chop them finely. Peel, wash and roughly grate the potatoes. Grate cheese coarsely. Mix potatoes, cheese, sour cream and parsley.
Season with salt and pepper.
Dab the meat dry and season with salt and pepper. Heat 2 tablespoons of oil in a large frying pan. Fry the steaks for about 6 minutes while turning. Remove and place on a baking tray. Spread the potato mixture over the steaks.
Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 10 minutes. Arrange steaks, vegetables and salad. Sprinkle with freshly ground pepper.