What does 辛子 mean?
辛子 is a Japanese noun meaning “mustard” in English. It is written as 辛子 in kanji, からし in hiragana, and karashi in romaji. This word is part of JLPT N5 vocabulary.
Example sentence
ホットドッグを２個、辛子とケチャップつきでおねがいします。
I'll have two hot dogs with mustard and ketchup.