If the herring is very salty, pre-soak it in cold boiled water or milk. Remove the fillet from the fish. (Today I had a ready-made herring fillet of light salting. Therefore, I didn’t soak anything ..) Soak bread in milk. Peel the apple. Twist the herring, eggs, onion, apple, soaked bread twice in a meat grinder. Add butter, lemon juice, pepper, if desired – sunflower oil. Taste for salt, add a little if needed. Mix well. Cool in the refrigerator. P.S. I didn’t add lemon juice.