A system is provided for heating a comestible. The system includes a container and a flexible vented package containing a liquid, semi-solid or liquid/solid combination comestible. The package is positioned within the container in a manner that hinders the comestible from escaping through the packages vent(s). The container is penetrable to microwaves and is adapted to not experience heat-induced damage when subjected to a heating cycle in a combination microwave and convection oven. The container is adapted to protect the package from heat-induced damage when the container is subjected to a heating cycle in a combination microwave and convection oven.