Soak the toast in cold water. Finely dice onion. Knead minced meat with egg, half of the onion cubes, squeezed toast, some salt and pepper well. Mix in the capers. Wash the roulades and dab dry. Spread with minced meat, roll up and pin with wooden skewers or roulade needles.
Heat oil in a roaster. Fry the roulades for about 5 minutes, turning them over. Season with salt and pepper. Add remaining onion cubes. Pour on stock, bring to the boil, cover and stew for about 30 minutes. Meanwhile wash the potatoes, cut into pieces and cook in salted water for about 20 minutes. Wash the parsley, dab dry and pluck from the stalks. Chop the leaves, except for a few for garnishing. Remove the roulades from the stew stock and keep warm. Stir lemon zest and sour cream into the stock, bring to the boil. Stir in binding agent. Season to taste with lemon juice, salt and pepper.
Chop the leaves, except for a few for garnishing. Remove the roulades from the stew stock and keep warm. Stir lemon zest and sour cream into the stock, bring to the boil. Stir in binding agent. Season to taste with lemon juice, salt and pepper. Add the roulades to the hot sauce. Drain potatoes, let them evaporate and sprinkle with parsley. Drain the beetroot. Wash the lemon. Peel half of the skin with a zest ripper in fine strips. Arrange roulades, potatoes and beetroot on plates, sprinkle with lemon zests. Garnish with caper apples, salad leaves and the remaining parsley
Drain potatoes, let them evaporate and sprinkle with parsley. Drain the beetroot. Wash the lemon. Peel half of the skin with a zest ripper in fine strips. Arrange roulades, potatoes and beetroot on plates, sprinkle with lemon zests. Garnish with caper apples, salad leaves and the remaining parsley