The story
From Cantonese. The first element appears to be unclear, either 鹹／咸 (haam4, “salty”) or 餡／馅 (haam6-2, “filling”). The second element is certainly 包 (baau1, “bun”), related to English baozi.
Etymology from Wiktionary, CC BY-SA 4.0.
hum bow
Today it means: char siu bao with browned glazed bread Full definition →