Senapssill

Senapssill is a Swedish preparation of herring in a mustard-flavored pickling marinade. The name derives from senap, Swedish for mustard, reflecting the pungent, tangy character of the dish. It is a traditional variant within the broader category of sill (herring) preparations found in Nordic cuisine.

The basic ingredients typically include salt-cured or brined herring fillets, vinegar, sugar, water, and mustard—often in the form of mustard seeds or prepared mustard. The pickling liquid is commonly seasoned with onion, dill, and sometimes white pepper or bay leaf, with lemon zest or oil appearing in some versions. The fillets are placed in the mustard-infused brine and left to marinate for several days, allowing the flavors to permeate the fish. The result is a tangy, slightly sweet, mustard-forward flavor that complements the firm texture of the herring.

Senapssill is widely served cold as part of a traditional Swedish smörgåsbord or julbord (Christmas buffet). It pairs well with boiled potatoes, crispbread, sour cream, and chives, and is commonly enjoyed with beer or Akvavit. While most commonly associated with Christmas traditions, senapssill is also featured at Easter, midsummer, and other festive occasions, reflecting the enduring popularity of pickled sill varieties in Swedish cuisine.

Variants and commercial preparations are available in jars or tins, and homeDIY versions are popular among cooks who enjoy customizing the level of mustard and sweetness in the brine. See also sill and Swedish Christmas and festive food traditions.