The invention relates to a method for preparing a food product by means of co-extrusion, where a casing composition and a barrier composition are co-extruded as layers upon an edible filler, such that the edible filler is provided with a casing layer and a barrier layer. After co-extrusion, the barrier layer is present between the edible filler and the casing layer. Advantageously, the casing composition includes collagen, a polysaccharide and water. Further, the invention relates to a food product. The food product, for instance a sausage, includes an edible filler, a casing layer, and a barrier layer, where the edible filler is covered by the barrier layer at least partly, and where the barrier composition is coverer by the casing layer at least partly.
