This originates in the kitchen knife ceremony held during the Heian period, and also based on the idea that, due to the influence of Buddhism, it should not be discussed as to whether a dish is tasty or not, while showing off their authority by eating rare food, and the idea that anyone can create a meal by heating.
これは、平安時代の包丁式に由来し、珍しいものばかり食べる事によって権威を見せつけ、尚且つ、仏教の影響から味の美味いまずいを論じてはいけない、という考えからと、加熱調理は誰でも出来る、という考えから来たものである。