Cut 4 soaked, filleted herring into 2 inch pieces and arrange on serving dish. Sprinkle each with a little (about 1/2 teaspoon) lemon juice and top with wafer-thin onion slices.

Fork-blend 1 cup of sour cream with 1 teaspoon powdered sugar and pour over herring. Refrigerate at least 1 hour before serving.

Optional: Just before serving, dust with paprika.