Pickled Herrings

• 6 herrings
• 1 onion

Herrings prepared like this will keep in a refrigerator for up to four weeks. They are very good to eat simply with a salad and brown bread and butter, or served as an hors d’œuvre.

Scale and wash the herrings, cut away the heads and tails. Slit each herring down the belly and clean the inside. Turn each herring open-side downwards on a working surface. Press firmly down the back bone t