Swedish Pickled Herring Appetizer

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1. 1Step 1: Place the pickling spice in the water and bring to a boil.
2. 2Step 2: Reduce the water to 1/2 cup and strain out the spent spices.
3. 3Step 3: Stir the dill weed, sugar, olive oil, and agrodolce vinegar into the water, then pour over the herring and onions in a container.
4. 4Step 4: Chill for 3-4 hours or longer before serving.