noun
retort-pouch food; packaged sterilized food
Refers to food sealed in a pouch and heat-sterilized, such as curry, pasta sauce, or rice packs. Common in supermarkets and convenience stores.
レトルト食品は非常食としても便利だ。
Retort-pouch food is also useful as emergency rations.
From English 'retort' (a pressure vessel for sterilization) plus 食品 (food). The term became common in Japan with the spread of retort-pouch technology.