Traditional northern German red herring salad: tender pickled Matjes herring fillets, cooked beetroot, tart apples, pickled gherkins, and hard-boiled eggs in a creamy sour cream dressing.
Dice the herring fillets, cooked beetroot, apple, and dill gherkins into uniform small cubes.
Whisk Schmand, mayonnaise, gherkin brine, mustard, salt, sugar, and white pepper in a large bowl until smooth.
Gently fold the diced ingredients into the creamy dressing until the salad turns a vibrant, gorgeous ruby pink. Cover and chill for at least 2 hours so flavors meld.
Garnish with sliced hard-boiled eggs and fresh dill sprigs. Serve with buttered dark rye bread.