A system comprising a cooking appliance in combination with a packaged food arrangement, the packaged food arrangement comprising an outer packaging and a food product disposed within the outer packaging, the outer packaging comprising first and second panels (212, 214) sealed to each other along their peripheral portions to form a bag defining an internal chamber therewithin, wherein the packaged food arrangement is adapted for expanding to drive the first panel and the second panel apart from each other under pressure of the gases created during the process of cooking the food product such that the outer packaging will rupture at a predetermined pressure and/or volume to release the gas, the cooking appliance comprising: a base body with a first heatable plate disposed therein; a lid body pivotably mounted to the base body and having a second heatable plate to be disposed above and generally opposite the first heatable plate, the second heatable plate mounted to the lid body via a mounting mechanism for movement in a substantially perpendicular direction relative to the first heatable plate; the lid body being pivotable relative to the base body between: an open configuration at which the second heatable plate is away from the first heatable plate and the packaged food arrangement can be placed on the first heatable plate; a closed configuration at which the second heatable plate is moved to be parallel and at a first closed relative distance to the first heatable plate such that the first heatable plate and the second heatable plate contact the first and second panels (212, 214) of the outer packaging, and wherein the second heatable plate is adapted to be movable away from the first heatable plate via the mounting mechanism in a direction generally perpendicular to the first heatable plate to remain parallel thereto by the expansion of the outer packaging up to a second closed relative distance greater than the first closed relative distance; characterised in that the second heatable plate is adapted to move towards the first heatable plate to a predetermined third closed relative distance being between the first closed relative distance and the second closed relative distance to contact the first and second panels (212, 214)of the outer packaging after rupturing of the outer packaging, and in that the lid body comprises a retaining assembly which retains the second heatable plate at the third closed relative distance to avoid flattening of the cooked food product. a base body with a first heatable plate disposed therein; a lid body pivotably mounted to the base body and having a second heatable plate to be disposed above and generally opposite the first heatable plate, the second heatable plate mounted to the lid body via a mounting mechanism for movement in a substantially perpendicular direction relative to the first heatable plate; the lid body being pivotable relative to the base body between: an open configuration at which the second heatable plate is away from the first heatable plate and the packaged food arrangement can be placed on the first heatable plate; a closed configuration at which the second heatable plate is moved to be parallel and at a first closed relative distance to the first heatable plate such that the first heatable plate and the second heatable plate contact the first and second panels (212, 214) of the outer packaging, and wherein the second heatable plate is adapted to be movable away from the first heatable plate via the mounting mechanism in a direction generally perpendicular to the first heatable plate to remain parallel thereto by the expansion of the outer packaging up to a second closed relative distance greater than the first closed relative distance; an open configuration at which the second heatable plate is away from the first heatable plate and the packaged food arrangement can be placed on the first heatable plate; a closed configuration at which the second heatable plate is moved to be parallel and at a first closed relative distance to the first heatable plate such that the first heatable plate and the second heatable plate contact the first and second panels (212, 214) of the outer packaging, and wherein the second heatable plate is adapted to be movable away from the first heatable plate via the mounting mechanism in a direction generally perpendicular to the first heatable plate to remain parallel thereto by the expansion of the outer packaging up to a second closed relative distance greater than the first closed relative distance; characterised in that the second heatable plate is adapted to move towards the first heatable plate to a predetermined third closed relative distance being between the first closed relative distance and the second closed relative distance to contact the first and second panels (212, 214)of the outer packaging after rupturing of the outer packaging, and in that the lid body comprises a retaining assembly which retains the second heatable plate at the third closed relative distance to avoid flattening of the cooked food product.