Wash the potatoes and cook in plenty of boiling water for about 20 minutes. Rinse briefly under cold water, drain and peel while still hot, cut into slices and let cool
Savoy cabbage clean, wash, cut off hard stalk. Remove leaves and cut off hard leaf panicles. Cut savoy cabbage into strips. Steam the savoy cabbage in a pot covered with a little salted water for about 10 minutes, remove, pour into a bowl and let cool. Clean, wash and cut the peppers into strips. Mix vinegar, broth and 2 tsp. mustard, season with salt, pepper and sugar, fold in 3 tbsp. oil. fold vinaigrette, savoy cabbage and paprika into the potatoes
Clean, wash and roughly chop the mushrooms. Heat 1 tablespoon of oil in a pan. Fry the mushrooms for 5-6 minutes, turning them until all the liquid has evaporated. Season mushrooms with salt, pepper and paprika powder, let cool off
Wash the parsley, shake dry. Pluck the leaves and chop them. Peel and finely chop the onion. Knead minced meat, breadcrumbs, egg, 1 teaspoon mustard, diced onion and half of the parsley, season with salt and pepper. Form into 12 meatballs, fill with mushroom mixture
Heat 2 tablespoons of oil in a frying pan and fry the meatballs for about 8 minutes, turning them over. Season salad again with salt, pepper and a little sugar. Arrange salad and meatballs in portions on plates