This is the 3592nd most frequent Japanese word.
辛子
Mustard.
In this sentence, '辛子' refers to mustard as a condiment enhancing the flavor of the food.
辛子をつけて食べると、美味しいですね。
Eating it with mustard makes it delicious.
Here, '辛子' describes a spiciness characteristic, emphasizing the strong flavor of the mustard.
この辛子はとても辛いので、少しだけ使ってください。
This mustard is very spicy, so please use only a little.
The term '辛子' is utilized to describe mustard's historical use as a seasoning in food preservation.