Ingredients:

1 bottle pickled herring (about 400g)
or some fillets

Sauce:

1 bottle sour cream
1 bottle creme fraiche
1 tube light mayonnaise
1-3 tablespoons curry
1/2dl sugar 
1 sourish green apple

Peel the apple and cut it into small pieces. Mix together the ingredients into the sauce. Try to get a suitable currytaste - different sorts have different hotness. Cut the herring into forkpieces and mix them and the apple pieces in the sauce. Let it stay a moment before serving.