Hylyng, known as with onion, is a specific preparation of herring recognized as a traditional product of Kashubia. This dish was officially entered onto the list of traditional products on June 14, 2006, within the Pomeranian Voivodeship. It represents a specific entry in the category of fishing products, distinguishing it as a protected regional food item.[1]
While herring appears in many international cuisines prepared in various ways, this specific Polish tradition focuses on the smoked variety served as a side dish. The source notes that herring is commonly prepared by boiling, frying, stewing, or baking globally, yet in Poland today, the most frequent presentation remains a side dish featuring herring. This local custom highlights the enduring presence of smoked fish in the regional diet.[1]