By, according to the invention, producing a food product tray (1) with a lid (2) using a basic material (3) such as aluminum, and providing said material (3) with a coating (4) comprising at least two layers (9 and 10), of which at least one of the materials has a high emission value, it is possible with a suitable dimensioning and placement of the coating (4) on the inner and/or outer side of the tray (1) and the lid (2) to obtain a hitherto unknown precise heating of the individual food products within the same heating time in an oven (12). The oven (12) has heating elements (14-16) which may abut against the sides and bottom of the tray as well as against the lid (2), said heating elements (14-16) may have a zonal heat emission in order to obtain the best possible cooking of the food. A QR code (20) on the lid (2) readable by the oven (12) allows for programming the oven with a view to both heat exposure intensity and position of the heat exposure in relation to the food products (6A and 7A) in the tray (1).
