Prepare the fish for marinating. Prepare the marinade by carefully mixing the natural seasoning with 1 tablespoon of flour or starch and 2 tablespoons of vegetable oil. Then cover the fish with the resulting mixture and leave it for 15 minutes for marinating.

Take a roasting bag out of the top section of the pack. Expand the bag and save the clip to be used later.

Put the marinated in the seasoning fish carefully in the roasting bag. Secure the clip firmly on the bag.

Preheat the oven to 180 °C. Lay the bag on the baking tray and puncture 3 holes in the upper part of the bag. Bake fish on the middle level of temperature the oven for 20-25 minutes.

Take the baking tray out with the bag out from the oven, gently open it and transfer the fish on the plate.