Ingredients

• 4 pieces dark bread, thinly sliced (See Intro)
• butter
• 8 ounces pickled herring (optional, of various varieties including ( plain marinated herring marinerede sild', spiced kryddet )
• thinly-sliced cheese (optional, in many varieties)
• processed meat, in thin slices (optional, or cured meat slices)
• smoked fish fillet (optional, such as salmon or mackerel in tomato sauce)
• pickled cucumber (optional, or sliced cucumber)
• tomatoes, slices
• red onion, cut in thin rings
• remoulade sauce
• sliced hard-boiled egg