Cut the onions into rings, boil them with the bay leaves and peppercorns in 750 ml water for 20 minutes and sift them.
Soak the gelatine and dissolve it in the warm seasoning stock. Season to taste with vinegar, pepper, salt and sugar.
Place 3 Bismarck herrings in a flat dish, cover with half the spice stock and let gel in the refrigerator.
Cut the eggs into slices. Layer three more Bismarck herrings with egg slices and 1 strip each of red and green peppers. Cover with the rest of the brew and let it set in the refrigerator.