PreparationMake pickled beets . Rinse and drain herring, discarding any onion. Pat herring dry between paper towels and cut into 1/2-inch pieces. Whisk together mustard, créme fraîche, sugars, water, onion, dill, and peppercorns and stir in herring. Chill, covered, 2 hours to allow flavors to develop. Spread butter evenly on 1 side of each bread slice and arrange herring mixture over half of slice. Drain beets well and arrange over remaining half.
PreparationMake pickled beets . Rinse and drain herring, discarding any onion. Pat herring dry between paper towels and cut into 1/2-inch pieces. Whisk together mustard, créme fraîche, sugars, water, onion, dill, and peppercorns and stir in herring. Chill, covered, 2 hours to allow flavors to develop. Spread butter evenly on 1 side of each bread slice and arrange herring mixture over half of slice. Drain beets well and arrange over remaining half.