A cooking apparatus is provided comprising a liquid heating unit. The cooking apparatus further includes a top cover and a bottom cover disposed below the top cover, wherein one or both of the top cover and the bottom cover include one or more fluid passages for flowing heating fluid from the liquid heating unit. The cooking apparatus includes a vacuum member that is in fluid communication with a food tray disposed between the top cover and bottom cover. The cooking apparatus further includes a control system configured to direct the removal of one or more gases (e.g., air) from the food tray and circulate heating fluid through the fluid passages for a predetermined period of time.