roast pork; char siu
Refers to the Chinese-style barbecued pork, often used in ramen or as a side dish.
The ramen has roast pork on top.
Standard spelling with okurigana.
Abbreviated kanji spelling, less common but still seen.
Compound of 焼き (grilled) and 豚 (pork). The slang sense is a homophone-based pun.