Abstract: A method of cooling ingesta includes the following steps: i) jetting an air from a port defined in a nozzle; ii) insufflating the jetted air directly to the ingesta; and iii) cooling the ingesta with the air. A method of cooling a food includes the following steps: i) putting the food on a plate having a ventilation; ii) passing the air in the food, by absorbing the air with a vacuum device disposed below the plate; and iii) cooling the food from an inner part thereof. Another method of cooling the food includes the following steps: i) putting the food on the plate having the ventilation; ii) passing the air in the food, by: insufflating the air from the nozzle to an upper part of the food and absorbing the air with the vacuum device disposed below the plate; and iii) cooling the food from the inner part thereof.