Marinated Herring Fillets in Cream Sauce

32% herring fillet (Clupea harengus), rapeseed oil, 9% cream, (7%) onion, (7%) gherkin, sugar, (3,5 %) apple, vinegar, yoghurt, salt, egg yolk, ground mustard, spices, thickener: guar gum, xanthan gum; preservatives: potassium sorbate, sodium benzoate; flavoring