-sour-cream sauce-
1 c  Sour cream
1/2 c  Yogurt
1/2 x  Lemon; juice only
1/4 ts Sugar
-salad--
2    Onions; small
2    Apples; medium, tart
8    Herring fillets; marinated
2 ts Dill; fresh or
1/2 ts Dillweed; dried

Sauce: Blend thoroughly sour cream, yogurt, lemon juice and sugar. Salad:
Peel onions and cut into thin slices. Peel and quarter apples, remove cores
and but into thin wedges. Blend onions and apples with sauce. In a dish
arrange herring and apple-onion mixture in layers. Cover tightly and
marinate in refrigerator for 5 hours. Sprinkle with dill before serving.