Peel and wash the potatoes. Soak rolls in cold water
Peel and chop two onions. Finely chop 1 tsp. capers. Knead with half of the onions, squeezed out roll, minced meat and egg, seasoning. Form 12-16 meatballs
Boil up about 1 1/2 l water, dissolve the stock in it. Add the meatballs and let them simmer at low heat for 15-20 minutes
In the meantime clean, wash and slice the mushrooms. Cook the potatoes in salted water for about 20 minutes
Remove the meatballs from the stock and keep warm in a bowl. Measure out 3/4 l stock
Heat the fat in a large pot. Sauté the mushrooms and remaining diced onions in it. Add flour and sweat. Deglaze everything with broth and milk while stirring, bring to the boil. Add the rest of the capers and simmer for about 5 minutes. Stir several times. Season to taste with salt, pepper and lemon
Meanwhile peel the small onion and dice it finely. Drain the beetroot and cucumber, collect the cucumber stock. Clean, wash and drain the salad. Arrange beetroot and cucumber on salad leaves. Spread some cucumber stock and diced onion over it
Add dumplings to the sauce. Drain the potatoes. Arrange everything and garnish with parsley and tomato if necessary