Soak herrings over night in cold water; remove the milch; cut off the head and skin and cut the herring into small pieces; add 2 apples, 2 pickles, 3 hard-boiled eggs, 1 onion, a few olives, all cut fine. Put into bowl; mash the milch with a little mustard, 1 teaspoonful of sugar, pepper and salt. Add ¼ cupful of vinegar and mix all well together. Garnish with sliced lemon, and serve with boiled potatoes.