Which elements characterize the iconic Kiluvõileib (sprat sandwich)?

Answer

Black bread with butter (or munavõi), fileted sprats, onions, and dill.

The Kiluvõileib features black bread spread with butter or egg butter (munavõi), topped with fileted sprats, onions, and dill, making it an iconic presentation of herring's relative, the sprat.

Which elements characterize the iconic Kiluvõileib (sprat sandwich)?
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