Peel and halve the onion. In a wide saucepan, boil up about 2 l water, 3 tbsp salt, pepper, bay leaf and onion. Cover and simmer for about 10 minutes
Peel the carrots and clean the spring onions. Wash everything and cut into fine strips. Boil up vinegar
Carefully wash the carp (do not damage the mucous membrane). Place the carp on a fat pan with the skin side facing upwards. Slowly pour the hot vinegar over it and let it steep for a short time so that the skin turns blue. Place carp in the hot stock. Cover and let simmer for about 15 minutes at medium heat
Heat the fat. Carrots and spring onions in it ca
Steam for 5 minutes. Peel, quarter, core and grate the apple. Mix immediately with lemon juice and sour cream, season to taste. Serve everything. Serve with boiled potatoes