Wash the potatoes and cook covered for about 20 minutes. Quench and peel
Bring almost 1/4 l water to the boil. Stir in stock, pepper, 1 pinch of sugar and vinegar. Stir in the oil. Pour the marinade hot over the potatoes. Cover and leave to stand for approx. 30 minutes.
Drain the beetroot and silver onions. Cut the beetroot into pieces. Wash the chives, shake dry and cut into fine rolls
Mix the prepared ingredients and capers, if necessary leave to stand a little longer. Season to taste and serve with the trout fillets
Drink: mineral water