Herring oil (for sandwiches)
→ 750 G SOFTENED BUTTER
→ 30 G MUSTARD
→ 250 G SALTED HERRING
Boneless herring fillets soak in milk or the tea infusion. After 6-8 hours, rub the fillet through a sieve.
Put the softened butter in a saucepan, add the mashed herring, mustard, and then beat everything thoroughly with a spatula.
Herring oil can be served as a cold snack for boiled potatoes or as a filling for sandwiches.