If necessary, soak the herring fillets. Cut into small pieces, mix in a salad bowl canned meat salad with herring. Add diced pickled cucumbers, peeled apples, chopped onion and cooked the day before and peeled potatoes. Mix the yogurt with the mayonnaise, mustard, season with salad. If the sauce is a thick - diluted cucumber marinade. Give infuse salad in the refrigerator for 8-10 hours, a few hours before feeding to remove the salad. Decorate with egg, tomato and parsley.