Drain the marinated juice from the jar of marinated herring pieces and place in a small bowl; set aside. The juice will be used to make the dressing.
Remove herring from jar and place in the bowl of a food processor. Lightly process for a few seconds until the herring is just coarsely chopped. Remove herring from food processor and place in a large bowl.
To make the dressing, add the olive oil, red wine vinegar, salt, and pepper to the set aside juice; whisk to combine.
Add the prepared dressing to the herring mixture and stir to combine.
Cover and store in the refrigerator until ready to serve. Serve with rye bread.
Makes a large amount.
* Feel free to add or delete the amount of marinated herring used, according to your family's taste. Pickled herring can be found in most large grocery stores during the Christmas season.
German Herring Salat - Pickled Herring Salad Recipe: https://whatscookingamerica.net/seafood/herringsalat.htm