Peel and wash the potatoes and cook in salted water for about 20 minutes
Peel and finely chop the onion. Knead with tartar, quark, breadcrumbs, mustard, salt and pepper. Form 3 dumplings from it
Bring a good 1/8 l water to the boil, stir in the stock. Cover the dumplings and cook for 8-10 minutes. Lift out and keep the stock
Melt the fat. Sweat flour in it until light yellow. Stir in stock, bring to the boil and simmer for about 5 minutes. Season to taste with salt, pepper and lemon juice. Heat dumplings and capers in it. Drain the potatoes. Serve everything
As a vegetable garnish to Königsberger meatballs, for example, a crunchy carrot raw food goes well with them. Season 2 tablespoons of low-fat yoghurt with lemon, salt, pepper and sugar. Grate 1 large carrot and possibly some apple