Drain the mixed pickles and collect the stock. Whip the cream lightly. Stir in horseradish, mayonnaise, sour cream and 6 tablespoons of stock. Season to taste with salt, pepper and lemon juice. Halve gherkins and corn on the cob.
Cut the herring into pieces. Wash the dill, dab dry, cut finely and stir into the sour cream. Carefully fold mixed pickles and herring into the sour cream. Leave the salad to stand in a cool place for about 1 hour. In the meantime peel, wash and slice the potatoes. Peel and finely chop the onion. Heat the oil in a pan. Fry the potato slices and onion until golden brown. Arrange herring in cream and fried potatoes on plates.
In the meantime peel, wash and slice the potatoes. Peel and finely chop the onion. Heat the oil in a pan. Fry the potato slices and onion until golden brown. Arrange herring in cream and fried potatoes on plates. Serve garnished with dill and lemon slices