Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   8      large         matjes herring fillets -- (1lb)
   1      cup           buttermilk
   1      cup           sour cream -- (or light sc)
     1/3  cup           plain non-fat yogurt
   1      medium        onion -- finely chopped
   2      medium        tart apples -- peeled, cored
                        chopped
   2      medium        dill pickles -- minced
   1      tablespoon    prepared horseradish
   1      tablespoon    fresh lemon juice
   1      tablespoon    sugar
                        salt -- pepper to taste

Preparation:

1. Lay the herring fillets in a shallow baking dish. Add the buttermilk, cover and marinate in the refrigerator overnight. 2. On the next day, drain and rinse the herring fillets well, then cut into bite-size pieces. Place the herring in a shallow glass or porcelain baking dish. 3. Combine the sour cream, yogurt, onion, apples, pickles, horseradish, lemon juice and sugar. Taste for lemon juice and sugar and add a bit more of each, if needed. 4. There should be a light lemon flavor and just enough sugar to mellow the tartness. Season the sauce to taste with salt and pepper. 5. Spoon over the herring, cover and marinate several hours in the refrigerator before serving.