split and dried saurel; butterflied dried horse mackerel
A specific food item: horse mackerel (aji) that has been split open, butterflied, and dried. Common in Japanese cuisine.
I grilled and ate split and dried horse mackerel for breakfast.
Compound of 開き (hiraki, 'split open') and 鯵 (aji, 'horse mackerel'). The exact historical derivation is uncertain, but the term straightforwardly describes the preparation method.