"醡" and "炸" in "醡醬麵" and "炸醬麵"
醡醬麵 and 炸醬麵


炸醬麵 can work as it means "noodles with fried sauce"

醡醬麵 is "noodles with extracted sauce (e.g. extracting oil)"


炸 fried (火 fire radical + phonetic 乍 zhà)
醡 extract (酉 container + 窄 narrow; from 穴 hole and 乍) Archaic character for 榨 (tool for extraction process. 木 wood used to refer to tools in this case)
醬 sauce
麵 noodles


Alternatively, 酢醬麵 is also used. The Koreans have used this but it's now written 炸醬麵. I guess the difference is 醡 is a much older usage which is now replaced with 炸 in modern times. Taiwan tends to retain older usage.