Step 1

In a glass measure, combine the vinegar and sugar until the sugar is completely dissolved. Add the aquavit, allspice and juniper berries.

Step 2

Drain the jarred herring in a colander and rinse in cold water. Remove the herring pieces, pat dry with paper towels and cut into uniform bite-sized pieces. Place half of the herring in a single layer in a glass bowl. Top with half of the onions and dill, repeat with the remaining ingredients and pour the marinade over the fish.

Step 3

Cover and refrigerate for at least 4 to 6 hours. To serve, drain the excess liquid and discard the berries. Garnish with additional fresh dill if desired.