In order to manufacture a food product which, with further preparation, can be given a form in which it is ready for immediate consumption, a consumable, at least sushi-like product roll is prepared. The product roll comprises a core with a filling which is enveloped by a casing of a high-carbohydrate composition followed by a barrier layer which covers the casing. The barrier layer is covered with a batter layer and the batter layer is covered with a crumb layer. The thus obtained body is subjected to a freezing step for complete freezing thereof. By way of preparation the frozen product roll, after optionally being defrosted, is heated by being baked or deep-fried until the core is at least no more than just defrosted, while the batter layer with the crumb layer has formed into a crispy outer layer. The product is thus given a directly consumable form.