Tartare of matjes herring and salmon

Matjes, or soused, herring is very popular in Germany, especially in the north. It is always eaten cold, sometimes in conjunction with hot side dishes. This appetizer is a combination of two tartares, totally different in character: the herring is strong and salty, while the salmon has a fine, fresh flavour. Traditional Westphalian pumpernickel is a dark, slightly sweet bread made of shredded rye grains soaked in water and then baked extremely slowly. It keeps for a long time and is one of