“salt” in Japanese is 塩, read en, shio (えん, しお). It is a Grade 4 Kyōiku kanji, taught in year 4 of Japanese elementary school, and appears in words such as 食塩 (table salt).
What does 塩 mean?
スープに塩を入れる。
Same sound, different character — the classic trap. Compare them side by side: