Panic - Hard porridge

…In the Wamyōshō, Oinoryo is pronounced as Ohoinotsukasa (Oho no Mame Kasa), with Ohoi meaning Ohoihi (large rice) and rice being today's kowameshi (strong rice) steamed in a koshiki (steamed rice). Today's boiled rice is called katakayu (cooked rice), and was managed by the shusuiji. Cooking is pronounced as kashiku, and although the origin is unknown, it seems to refer to a cooking method in which a kettle is placed on top of a hearth and then a koshiki is placed on top of it to steam the food. …

*Some of the terminology explanations that mention "饘" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…大炊寮は《和名抄》ではオホイノツカサ(於保為乃豆加佐)と訓じ，オホイはオホイヒ(大飯)で，飯は甑（こしき）で蒸した今日の強飯（こわめし）である。今日の米を煮た飯は饘（かたかゆ）で主水司がつかさどった。炊はカシクと訓じ，語源は不詳だが，竈に釜をのせさらに甑をのせて蒸す調理法を表すようである。…

※「饘」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報